161-670: Hulegu Khan , also known as Hülegü or Hulagu ( c. 1217 – 8 February 1265), was a Mongol ruler who conquered much of Western Asia . Son of Tolui and the Keraite princess Sorghaghtani Beki , he was a grandson of Genghis Khan and brother of Ariq Böke , Möngke Khan , and Kublai Khan . Hulegu's army greatly expanded the southwestern portion of the Mongol Empire , founding the Ilkhanate in Persia . Under Hulegu's leadership,
322-448: A binary black hole . A second gravitational wave was detected on 26 December 2015 and additional observations should continue but gravitational waves require extremely sensitive instruments. The combination of observations made using electromagnetic radiation, neutrinos or gravitational waves and other complementary information, is known as multi-messenger astronomy . One of the oldest fields in astronomy, and in all of science,
483-562: A few milliseconds to thousands of seconds before fading away. Only 10% of gamma-ray sources are non-transient sources. These steady gamma-ray emitters include pulsars, neutron stars , and black hole candidates such as active galactic nuclei. In addition to electromagnetic radiation, a few other events originating from great distances may be observed from the Earth. In neutrino astronomy , astronomers use heavily shielded underground facilities such as SAGE , GALLEX , and Kamioka II/III for
644-851: A massive Mongol army to conquer or destroy the remaining Muslim states in southwestern Asia. Hulegu's campaign sought the subjugation of the Lurs of southern Iran, the destruction of the Nizari Ismaili state (the Assassins) , the submission or destruction of the Abbasid Caliphate in Baghdad , the submission or destruction of the Ayyubid states in Syria based in Damascus , and finally,
805-739: A mixed Xiongnu-Donghu ancestry for some tribes (e.g. the Khitan ). The Donghu are mentioned by Sima Qian as already existing in Inner Mongolia north of Yan in 699–632 BCE along with the Shanrong . Unofficial Chinese sources such as Yi Zhou Shu ("Lost Book of Zhou") and the Classic of Mountains and Seas project the Donghu's activities back to the Shang dynasty (1600–1046 BCE). However,
966-552: A model allows astronomers to select between several alternative or conflicting models. Theorists also modify existing models to take into account new observations. In some cases, a large amount of observational data that is inconsistent with a model may lead to abandoning it largely or completely, as for geocentric theory , the existence of luminiferous aether , and the steady-state model of cosmic evolution. Phenomena modeled by theoretical astronomers include: Modern theoretical astronomy reflects dramatic advances in observation since
1127-671: A number of important astronomers. Richard of Wallingford (1292–1336) made major contributions to astronomy and horology , including the invention of the first astronomical clock, the Rectangulus which allowed for the measurement of angles between planets and other astronomical bodies, as well as an equatorium called the Albion which could be used for astronomical calculations such as lunar , solar and planetary longitudes and could predict eclipses . Nicole Oresme (1320–1382) and Jean Buridan (1300–1361) first discussed evidence for
1288-604: A part of Hulegu's army. Hulegu's Mongol army set out for Baghdad in November 1257. Once near the city he divided his forces to threaten the city on both the east and west banks of the Tigris. Hulegu demanded surrender, but the caliph, Al-Musta'sim , refused. Due to the treason of Abu Alquma, an advisor to Al-Muta'sim, an uprising in the Baghdad army took place and Siege of Baghdad began. The attacking Mongols broke dikes and flooded
1449-851: A refuge for the Infidels, your enemies and ours, by having your subjects diligently patrol the seas. Despite many attempts, neither Hulegu nor his successors were able to form an alliance with Europe, although Mongol culture in the West was in vogue in the 13th century. Many new-born children in Italy were named after Mongol rulers, including Hulegu: names such as Can Grande ("Great Khan"), Alaone (Hulegu), Argone ( Arghun ), and Cassano ( Ghazan ) are recorded. Hulegu had fourteen wives and concubines with at least 21 issues with them: Principal wives: Concubines: Hulegu Khan fell seriously ill in January 1265 and died
1610-578: A repeating cycle known as a saros . Following the Babylonians, significant advances in astronomy were made in ancient Greece and the Hellenistic world. Greek astronomy is characterized from the start by seeking a rational, physical explanation for celestial phenomena. In the 3rd century BC, Aristarchus of Samos estimated the size and distance of the Moon and Sun , and he proposed a model of
1771-677: A small army and 200 Kalmyk soldiers defeated 1,700 Soviet soldiers in Durvud province of Kalmykia but the Oirats' state was destroyed by the Soviet Army in 1930. Kalmykian nationalists and Pan-Mongolists attempted to migrate Kalmyks to Mongolia in the 1920s. Mongolia suggested to migrate the Soviet Union's Mongols to Mongolia in the 1920s but Russia refused the suggestion. Stalin deported all Kalmyks to Siberia in 1943 and around half of
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#17327729366001932-399: A sovereign state or merge Inner Mongolia with Mongolia. Mongolian is the official national language of Mongolia, where it is spoken by nearly 2.8 million people (2010 estimate), and the official provincial language of China's Inner Mongolia Autonomous Region , where there are at least 4.1 million ethnic Mongols. Across the whole of China, the language is spoken by roughly half of
2093-608: A substantial amount of work in the realms of theoretical and observational physics. Some areas of study for astrophysicists include their attempts to determine the properties of dark matter , dark energy , and black holes ; whether or not time travel is possible, wormholes can form, or the multiverse exists; and the origin and ultimate fate of the universe . Topics also studied by theoretical astrophysicists include Solar System formation and evolution ; stellar dynamics and evolution ; galaxy formation and evolution ; magnetohydrodynamics ; large-scale structure of matter in
2254-736: A tribe of Shiwei . It resurfaced in the late 11th century during the Khitan -ruled Liao dynasty . After the fall of the Liao in 1125, the Khamag Mongols became a leading tribe on the Mongolian Plateau . However, their wars with the Jurchen -ruled Jin dynasty and the Tatar confederation had weakened them. In the thirteenth century, the word Mongol grew into an umbrella term for a large group of Mongolic-speaking tribes united under
2415-427: Is visible light , or more generally electromagnetic radiation . Observational astronomy may be categorized according to the corresponding region of the electromagnetic spectrum on which the observations are made. Some parts of the spectrum can be observed from the Earth's surface, while other parts are only observable from either high altitudes or outside the Earth's atmosphere. Specific information on these subfields
2576-586: Is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics , physics , and chemistry in order to explain their origin and their overall evolution . Objects of interest include planets , moons , stars , nebulae , galaxies , meteoroids , asteroids , and comets . Relevant phenomena include supernova explosions, gamma ray bursts , quasars , blazars , pulsars , and cosmic microwave background radiation . More generally, astronomy studies everything that originates beyond Earth's atmosphere . Cosmology
2737-590: Is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky . These include the Egyptians , Babylonians , Greeks , Indians , Chinese , Maya , and many ancient indigenous peoples of the Americas . In the past, astronomy included disciplines as diverse as astrometry , celestial navigation , observational astronomy , and
2898-444: Is about 90,000 dead; higher estimates range from 200,000 to a million. The Mongols looted and then destroyed buildings. Mosques, palaces, libraries, hospitals—grand buildings that had been the work of generations—were burned to the ground. The caliph was captured and forced to watch as his citizens were murdered and his treasury plundered. Il Milione , a book on the travels of Venetian merchant Marco Polo , states that Hulegu starved
3059-584: Is absorbed by the Earth's atmosphere, requiring observations at these wavelengths to be performed from the upper atmosphere or from space. Ultraviolet astronomy is best suited to the study of thermal radiation and spectral emission lines from hot blue stars ( OB stars ) that are very bright in this wave band. This includes the blue stars in other galaxies, which have been the targets of several ultraviolet surveys. Other objects commonly observed in ultraviolet light include planetary nebulae , supernova remnants , and active galactic nuclei. However, as ultraviolet light
3220-595: Is also believed that the ruins at Great Zimbabwe and Timbuktu may have housed astronomical observatories. In Post-classical West Africa , Astronomers studied the movement of stars and relation to seasons, crafting charts of the heavens as well as precise diagrams of orbits of the other planets based on complex mathematical calculations. Songhai historian Mahmud Kati documented a meteor shower in August 1583. Europeans had previously believed that there had been no astronomical observation in sub-Saharan Africa during
3381-583: Is an inseparable part of the discipline of astrobiology. Astrobiology concerns itself with interpretation of existing scientific data , and although speculation is entertained to give context, astrobiology concerns itself primarily with hypotheses that fit firmly into existing scientific theories . This interdisciplinary field encompasses research on the origin of planetary systems , origins of organic compounds in space , rock-water-carbon interactions, abiogenesis on Earth, planetary habitability , research on biosignatures for life detection, and studies on
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#17327729366003542-427: Is easily absorbed by interstellar dust , an adjustment of ultraviolet measurements is necessary. X-ray astronomy uses X-ray wavelengths . Typically, X-ray radiation is produced by synchrotron emission (the result of electrons orbiting magnetic field lines), thermal emission from thin gases above 10 (10 million) kelvins , and thermal emission from thick gases above 10 Kelvin. Since X-rays are absorbed by
3703-414: Is founded on the detection and analysis of infrared radiation, wavelengths longer than red light and outside the range of our vision. The infrared spectrum is useful for studying objects that are too cold to radiate visible light, such as planets, circumstellar disks or nebulae whose light is blocked by dust. The longer wavelengths of infrared can penetrate clouds of dust that block visible light, allowing
3864-464: Is from these clouds that solar systems form. Studies in this field contribute to the understanding of the formation of the Solar System , Earth's origin and geology, abiogenesis , and the origin of climate and oceans. Astrobiology is an interdisciplinary scientific field concerned with the origins , early evolution , distribution, and future of life in the universe . Astrobiology considers
4025-416: Is given below. Radio astronomy uses radiation with wavelengths greater than approximately one millimeter, outside the visible range. Radio astronomy is different from most other forms of observational astronomy in that the observed radio waves can be treated as waves rather than as discrete photons . Hence, it is relatively easier to measure both the amplitude and phase of radio waves, whereas this
4186-645: Is not as easily done at shorter wavelengths. Although some radio waves are emitted directly by astronomical objects, a product of thermal emission , most of the radio emission that is observed is the result of synchrotron radiation , which is produced when electrons orbit magnetic fields . Additionally, a number of spectral lines produced by interstellar gas , notably the hydrogen spectral line at 21 cm, are observable at radio wavelengths. A wide variety of other objects are observable at radio wavelengths, including supernovae , interstellar gas, pulsars , and active galactic nuclei . Infrared astronomy
4347-475: Is one of the few sciences in which amateurs play an active role . This is especially true for the discovery and observation of transient events . Amateur astronomers have helped with many important discoveries, such as finding new comets. Astronomy (from the Greek ἀστρονομία from ἄστρον astron , "star" and -νομία -nomia from νόμος nomos , "law" or "culture") means "law of the stars" (or "culture of
4508-1098: Is referred to as the Mongol heartland , especially in history books. The ancestors of the modern-day Mongols are referred to as Proto-Mongols . Broadly defined, the term includes the Mongols proper (also known as the Khalkha Mongols ), Buryats , Oirats , the Kalmyks and the Southern Mongols. The latter comprises the Abaga Mongols , Abaganar , Aohans , Arkhorchin, Asud , Baarins , Chahars , Darkhan ( Shar Darkhad ), Dörvön Khüükhed, Eastern Dorbets , Gorlos Mongols , Ikhmyangan, Jalaids, Jaruud, Kharchins , Khishigten , Khorchins , Khuuchid, Muumyangan, Naimans , Onnigud, Ordos , Sunud, Tumed , Urad and Üzemchins . The designation "Mongol" briefly appeared in 8th century records of Tang China to describe
4669-479: Is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the astronomical objects , rather than their positions or motions in space". Among the objects studied are the Sun , other stars , galaxies , extrasolar planets , the interstellar medium and the cosmic microwave background . Their emissions are examined across all parts of the electromagnetic spectrum , and
4830-502: Is the measurement of the positions of celestial objects. Historically, accurate knowledge of the positions of the Sun, Moon, planets and stars has been essential in celestial navigation (the use of celestial objects to guide navigation) and in the making of calendars . Careful measurement of the positions of the planets has led to a solid understanding of gravitational perturbations , and an ability to determine past and future positions of
4991-720: The Armenian Kingdom of Cilicia under Hethum I, King of Armenia and the Franks of Bohemond VI of Antioch . This force conquered Muslim Syria, a domain of the Ayyubid dynasty. They captured Aleppo by siege and, under the Christian general Kitbuqa , seized Damascus on 1 March 1260. A Christian Mass was celebrated in the Umayyad Mosque and numerous mosques were profaned. Many historical accounts describe
Hulegu Khan - Misplaced Pages Continue
5152-478: The Caucasus in 1263. This was the first open war between Mongols and signaled the end of the unified empire. In retaliation for his failure, Hulegu killed Berke's ortogh , and Berke did the same in return. Even while Berke was Muslim, out of Mongol brotherhood he at first resisted the idea of fighting Hulegu. He said, "Mongols are killed by Mongol swords. If we were united, then we would have conquered all of
5313-484: The Compton Gamma Ray Observatory or by specialized telescopes called atmospheric Cherenkov telescopes . The Cherenkov telescopes do not detect the gamma rays directly but instead detect the flashes of visible light produced when gamma rays are absorbed by the Earth's atmosphere. Most gamma-ray emitting sources are actually gamma-ray bursts , objects which only produce gamma radiation for
5474-723: The Dai Khitai in Afghanistan. With the expansion of the Mongol Empire, the Mongolic peoples settled over almost all Eurasia and carried on military campaigns from the Adriatic Sea to Indonesian Java and from Japan to Palestine . They simultaneously became Padishahs of Persia , Emperors of China , and Great Khans of the Mongols, and one ( Al-Adil Kitbugha ) became Sultan of Egypt . The Mongolic peoples of
5635-524: The Earth's atmosphere , all X-ray observations must be performed from high-altitude balloons , rockets , or X-ray astronomy satellites . Notable X-ray sources include X-ray binaries , pulsars , supernova remnants , elliptical galaxies , clusters of galaxies , and active galactic nuclei . Gamma ray astronomy observes astronomical objects at the shortest wavelengths of the electromagnetic spectrum. Gamma rays may be observed directly by satellites such as
5796-625: The Golden Horde established themselves to govern Russia by 1240. By 1279, they conquered the Song dynasty and brought all of China proper under the control of the Yuan dynasty . ... from Chinggis up high down to the common people, all are shaven in the style pojiao . As with small boys in China, they leave three locks, one hanging from the crown of their heads. When it has grown some, they clip it;
5957-977: The Milky Way , as its own group of stars was only proven in the 20th century, along with the existence of "external" galaxies. The observed recession of those galaxies led to the discovery of the expansion of the Universe . In 1919, when the Hooker Telescope was completed, the prevailing view was that the universe consisted entirely of the Milky Way Galaxy. Using the Hooker Telescope, Edwin Hubble identified Cepheid variables in several spiral nebulae and in 1922–1923 proved conclusively that Andromeda Nebula and Triangulum among others, were entire galaxies outside our own, thus proving that
6118-844: The Ming dynasty . After the fall of the Yuan dynasty in 1368, the Mongols continued to rule the Northern Yuan in northern China and the Mongolian steppe. However, the Oirads began to challenge the Eastern Mongols under the Borjigin monarchs in the late 14th century and Mongolia was divided into two parts: Western Mongolia ( Oirats ) and Eastern Mongolia ( Khalkha , Inner Mongols , Barga , Buryats ). The earliest written references to
6279-658: The Mongolia-Russia border . Oka Buryats revolted in 1767 and Russia completely conquered the Buryat region in the late 18th century. Russia and Qing were rival empires until the early 20th century, however, both empires carried out united policy against Central Asians. The Qing Empire conquered Upper Mongolia or the Oirat's Khoshut Khanate in the 1720s and 80,000 people were killed. By that period, Upper Mongolian population reached 200,000. The Dzungar Khanate conquered by
6440-597: The Mongolian and Tibetan Affairs Commission , lie dormant. Agin-Buryat Okrug and Ust-Orda Buryat Okrugs merged with Irkutsk Oblast and Chita Oblast in 2008 despite Buryats' resistance. Small scale protests occurred in Inner Mongolia in 2011 . The Inner Mongolian People's Party is a member of the Unrepresented Nations and Peoples Organization and its leaders are attemptin to establish
6601-983: The Mongols sacked and destroyed Baghdad ending the Islamic Golden Age and weakened Damascus , causing a shift of Islamic influence to the Mamluk Sultanate in Cairo and ended the Abbasid Dynasty . Hulegu was born to Tolui , one of Genghis Khan's sons, and Sorghaghtani Beki , an influential Keraite princess and a niece of Toghrul in 1217. Not much is known of Hulegu's childhood except of an anecdote given in Jami' al-Tawarikh and he once met his grandfather Genghis Khan with Kublai in 1224. Hulegu's brother Möngke Khan had been installed as Great Khan in 1251. Möngke charged Hulegu with leading
Hulegu Khan - Misplaced Pages Continue
6762-794: The Muslim world by the early 9th century. In 964, the Andromeda Galaxy , the largest galaxy in the Local Group , was described by the Persian Muslim astronomer Abd al-Rahman al-Sufi in his Book of Fixed Stars . The SN 1006 supernova , the brightest apparent magnitude stellar event in recorded history, was observed by the Egyptian Arabic astronomer Ali ibn Ridwan and Chinese astronomers in 1006. Iranian scholar Al-Biruni observed that, contrary to Ptolemy ,
6923-502: The Renaissance , Nicolaus Copernicus proposed a heliocentric model of the solar system. His work was defended by Galileo Galilei and expanded upon by Johannes Kepler . Kepler was the first to devise a system that correctly described the details of the motion of the planets around the Sun. However, Kepler did not succeed in formulating a theory behind the laws he wrote down. It was Isaac Newton , with his invention of celestial dynamics and his law of gravitation , who finally explained
7084-584: The Shiwei (a subtribe called the "Shiwei Menggu" is held to be the origin of the Genghisid Mongols). Besides these three Xianbei groups, there were others such as the Murong , Duan and Tuoba . Their culture was nomadic, their religion shamanism or Buddhism and their military strength formidable. There is still no direct evidence that the Rouran spoke Mongolic languages , although most scholars agree that they were Proto-Mongolic. The Khitan, however, had two scripts of their own and many Mongolic words are found in their half-deciphered writings. Geographically,
7245-537: The Shiwei . The Khitans, who were independent after their separation from the Kumo Xi (of Wuhuan origin) in 388, continued as a minor power in Manchuria until one of them, Abaoji (872–926), established the Liao dynasty (916–1125). The destruction of Uyghur Khaganate by the Kirghiz resulted in the end of Turkic dominance in Mongolia. According to historians, Kirghiz were not interested in assimilating newly acquired lands; instead, they controlled local tribes through various manaps (tribal leaders). The Khitans occupied
7406-501: The Solar System where the Earth and planets rotated around the Sun, now called the heliocentric model. In the 2nd century BC, Hipparchus discovered precession , calculated the size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe . Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive from Greek astronomy. The Antikythera mechanism ( c. 150 –80 BC)
7567-428: The Soviet–Japanese War of 1945 (Mongolian name: Liberation War of 1945 ). Japan forced Inner Mongolian and Barga people to fight against Mongolians but they surrendered to Mongolians and started to fight against their Japanese and Manchu allies. Marshal Khorloogiin Choibalsan called Inner Mongolians and Xinjiang Oirats to migrate to Mongolia during the war but the Soviet Army blocked Inner Mongolian migrants' way. It
7728-447: The Tuoba Xianbei ruled the southern part of Inner Mongolia and northern China, the Rouran ( Yujiulü Shelun was the first to use the title khagan in 402) ruled eastern Mongolia, western Mongolia, the northern part of Inner Mongolia and northern Mongolia, the Khitan were concentrated in eastern part of Inner Mongolia north of Korea and the Shiwei were located to the north of the Khitan. These tribes and kingdoms were soon overshadowed by
7889-495: The Xiongnu , whose identity is still debated today. Although some scholars maintain that they were proto-Mongols , they were more likely a multi-ethnic group of Mongolic and Turkic tribes . It has been suggested that the language of the Huns was related to the Xiongnu. The Donghu, however, can be much more easily labeled proto-Mongol since the Chinese histories trace only Mongolic tribes and kingdoms ( Xianbei and Wuhuan peoples) from them, although some historical texts claim
8050-468: The Yakuts after their migration to northern Siberia and about 30% of Yakut words have Mongol origin. However, remnants of the Yuan imperial family retreated north to Mongolia in 1368, retaining their language and culture. There were 250,000 Mongols in southern China and many Mongols were massacred by the rebel army. The survivors were trapped in southern China and eventually assimilated. The Dongxiangs , Bonans , Yugur and Monguor people were invaded by
8211-427: The interstellar medium . The study of the abundance of elements and isotope ratios in Solar System objects, such as meteorites , is also called cosmochemistry , while the study of interstellar atoms and molecules and their interaction with radiation is sometimes called molecular astrophysics. The formation, atomic and chemical composition, evolution and fate of molecular gas clouds is of special interest, because it
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#17327729366008372-436: The (97,000–98,000) Kalmyks deported to Siberia died before being allowed to return home in 1957. The government of the Soviet Union forbade teaching the Kalmyk language during the deportation. The Kalmyks' main purpose was to migrate to Mongolia and many Kalmyks joined the German Army. Marshal Khorloogiin Choibalsan attempted to migrate the deportees to Mongolia and he met with them in Siberia during his visit to Russia. Under
8533-399: The 14–16th centuries, however, the Ming dynasty was defeated by the Oirat, Southern Mongol, Eastern Mongol and united Mongol armies. Esen's 30,000 cavalries defeated 500,000 Chinese soldiers in the 1449 Tumu Crisis . Within eighteen months of his defeat of the titular Khan Taisun, in 1453, Esen himself took the title of Great Khan (1454–1455) of the Great Yuan . The Khalkha emerged during
8694-491: The 15th century and this conflict weakened Mongol strength. In 1688, the Western Mongol Dzungar Khanate 's king Galdan Boshugtu attacked Khalkha after murder of his younger brother by Tusheet Khan Chakhundorj (main or Central Khalkha leader) and the Khalkha-Oirat War began. Galdan threatened to kill Chakhundorj and Zanabazar (Javzandamba Khutagt I, spiritual head of Khalkha) but they escaped to Sunud (Inner Mongolia). Many Khalkha nobles and folks fled to Inner Mongolia because of
8855-442: The 1990s, including studies of the cosmic microwave background , distant supernovae and galaxy redshifts , which have led to the development of a standard model of cosmology . This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations. Astrophysics
9016-527: The Bogd Khan regime. Russia encouraged Mongolia to become an autonomous region of China in 1914. Mongolia lost Barga , Dzungaria, Tuva , Upper Mongolia and Inner Mongolia in the 1915 Treaty of Kyakhta . In October 1919, the Republic of China occupied Mongolia after the suspicious deaths of Mongolian patriotic nobles. On 3 February 1921 the White Russian army—led by Baron Ungern and mainly consisting of Mongolian volunteer cavalries, and Buryat and Tatar cossacks —liberated Ulaanbaatar . Baron Ungern's purpose
9177-432: The Bogd Khanate, and the Russian czar, Nicholas II , referred to it as "Mongolian imperialism". Additionally, the United Kingdom urged Russia to abolish Mongolian independence as it was concerned that "if Mongolians gain independence, then Central Asians will revolt". 10,000 Khalkha and Inner Mongolian cavalries (about 3,500 Inner Mongols) defeated 70,000 Chinese soldiers and controlled almost all of Inner Mongolia; however,
9338-466: The Buryat population in Russia died in the 1900s–1950s. 10,000 Buryats of the Buryat-Mongol Autonomous Soviet Socialist Republic were massacred by Stalin's order in the 1930s. In 1919 the Buryats established a small theocratic Balagad state in Kizhinginsky District of Russia and it fell in 1926. In 1958, the name "Mongol" was removed from the name of the Buryat-Mongol Autonomous Soviet Socialist Republic. On 22 January 1922 Mongolia proposed to migrate
9499-417: The Communists were unable to defeat Japan and Kuomintang . Mongolia and Soviets supported the Uyghur and Kazakh separatist movement during the 1930s and 1940s. By 1945, the Soviets refused to support them after its alliance with the Chinese Communist Party and Mongolia interrupted its relations with the separatists under pressure. Xinjiang Oirat militant groups operated together the Turkic peoples but
9660-403: The Earth's atmosphere and of their physical and chemical properties", while "astrophysics" refers to the branch of astronomy dealing with "the behavior, physical properties, and dynamic processes of celestial objects and phenomena". In some cases, as in the introduction of the introductory textbook The Physical Universe by Frank Shu , "astronomy" may be used to describe the qualitative study of
9821-418: The Great said: "The headwaters of the Yenisei River must be Russian land". The Russian Empire sent the Kalmyks and Buryats to war to reduce the populations ( World War I and other wars). During the 20th century, Soviet scientists attempted to convince the Kalmyks and Buryats that they're not Mongols during (demongolization policy). 35,000 Buryats were killed during a rebellion in 1927, and around one-third of
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#17327729366009982-458: The Hu (胡) were not mentioned among the non-Shang fang (方 "border-region"; modern term fāngguó 方國 "fang-countries") in the extant oracle bones from the Shang period. The Xianbei formed part of the Donghu confederation, and possibly had in earlier times some independence within the Donghu confederation as well as from the Zhou dynasty. During the Warring States the poem " The Great Summons " ( Chinese : 大招 ; pinyin : Dà zhāo ) in
10143-425: The Kalmyk Khanate. The Kyrgyzs attacked them near Balkhash Lake . About 100,000–150,000 Kalmyks who settled on the west bank of the Volga River could not cross the river because the river did not freeze in the winter of 1771 and Catherine the Great executed influential nobles of them. After seven months of travel, only one-third (66,073) of the original group reached Dzungaria (Balkhash Lake, western border of
10304-401: The Kalmyks during the Kalmykian Famine but bolshevik Russia refused. 71,000–72,000 (93,000?; around half of the population) Kalmyks died during the Russian famine of 1921–22 . The Kalmyks revolted against the Soviet Union in 1926, 1930 and 1942–1943. In 1913, Nicholas II , tsar of Russia, said: "We need to prevent from Volg Tatars . But the Kalmyks are more dangerous than them because they are
10465-438: The Kazakhs to migrate westwards. In 1687, he besieged the City of Turkistan . Under the leadership of Abul Khair Khan , the Kazakhs won major victories over the Dzungars at the Bulanty River in 1726, and at the Battle of Anrakay in 1729. The Khalkha eventually submitted to Qing rule in 1691 by Zanabazar 's decision, thus bringing all of today's Mongolia under the rule of the Qing dynasty but Khalkha de facto remained under
10626-482: The Law of the Russian Federation of April 26, 1991 "On Rehabilitation of Exiled Peoples," repressions against Kalmyks and other peoples were qualified as acts of genocide. On 3 October 2002 the Ministry of Foreign Affairs announced that Taiwan recognizes Mongolia as an independent country, although no legislative actions were taken to address concerns over its constitutional claims to Mongolia. Offices established to support Taipei's claims over Outer Mongolia, such as
10787-413: The Liao dynasty led by Yelü Dashi fled west through Mongolia after being defeated by the Jurchen -led Jin dynasty and founded the Qara Khitai (Western Liao dynasty) in 1124 while still maintaining control over western Mongolia. In 1218, Genghis Khan incorporated the Qara Khitai after which the Khitan passed into obscurity. Some remnants surfaced as the Qutlugh-Khanid dynasty (1222–1306) in Iran and
10948-400: The Lurs, and the Assassins surrendered their impregnable fortress of Alamut without a fight, accepting a deal that spared the lives of their people in early 1256. He chose Azerbaijan as his power base, while ordering Baiju to retreat to Anatolia. From at least 1257 onwards, Muslims and Christians of every major religious variety in Europe , the Middle East , and mainland Asia were
11109-445: The Mamluks and avenge the defeat at Ain Jalut, however, he was instead drawn into civil war with Batu Khan 's brother Berke . Berke Khan, a Muslim convert and the grandson of Genghis Khan, had promised retribution in his rage after Hulegu's sack of Baghdad and allied himself with the Mamluks. He initiated a large series of raids on Hulegu's territories, led by Nogai Khan . Hulegu suffered a severe defeat in an attempted invasion north of
11270-446: The Manchus attack in exchange for thousands of taels of silver. By the 1620s, only the Chahars remained under his rule. The Chahar army was defeated in 1625 and 1628 by the Inner Mongol and Manchu armies due to Ligdan's faulty tactics. The Qing forces secured their control over Inner Mongolia by 1635, and the army of the last khan Ligdan moved to battle against Tibetan Gelugpa sect (Yellow Hat sect) forces. The Gelugpa forces supported
11431-431: The Manchus, while Ligdan supported Kagyu sect (Red Hat sect) of Tibetan Buddhism . Ligden died in 1634 on his way to Tibet . By 1636, most Inner Mongolian nobles had submitted to the Qing dynasty founded by the Manchus. Inner Mongolian Tengis noyan revolted against the Qing in the 1640s and the Khalkha battled to protect Sunud. Western Mongol Oirats and Eastern Mongolian Khalkhas vied for domination in Mongolia since
11592-651: The Mongol army of about 12,000 in the Battle of Ain Jalut and fought relentlessly for many hours. The Mamluk leader Baybars mostly implemented hit-and-run tactics in an attempt to lure the Mongol forces into chasing him. Baybars and Qutuz had hidden the bulk of their forces in the hills to wait in ambush for the Mongols to come into range. The Mongol leader Kitbuqa , already provoked by the constant fleeing of Baybars and his troops, decided to march forwards with all his troops on
11753-496: The Mongol capture of Damascus, looting of Baghdad, and conquest of Syria. The Mongols, for their part, attempted to form a Frankish-Mongol alliance with (or at least, demand the submission of) the remnant of the Crusader Kingdom of Jerusalem, now centered on Acre, but Pope Alexander IV had forbidden such an alliance. Tensions between Franks and Mongols also increased when Julian of Sidon caused an incident resulting in
11914-416: The Mongolian army retreated due to lack of weapons in 1914. 400 Mongol soldiers and 3,795 Chinese soldiers died in this war. The Khalkhas, Khovd Oirats, Buryats, Dzungarian Oirats, Upper Mongols , Barga Mongols , most Inner Mongolian and some Tuvan leaders sent statements to support Bogd Khan's call of Mongolian reunification . In reality however, most of them were too prudent or irresolute to attempt joining
12075-476: The Mongols so send them to war to reduce the population". On 23 April 1923 Joseph Stalin , communist leader of Russia, said: "We are carrying out wrong policy on the Kalmyks who related to the Mongols. Our policy is too peaceful". In March 1927, Soviet deported 20,000 Kalmyks to Siberia, the tundra and Karelia .The Kalmyks founded the sovereign Republic of Oirat-Kalmyk on 22 March 1930. The Oirats' state had
12236-642: The Oirats and Khalkhas before the war. Galdan Boshugtu sent his army to "liberate" Inner Mongolia after defeating the Khalkha's army and called Inner Mongolian nobles to fight for Mongolian independence. Some Inner Mongolian nobles, Tibetans , Kumul Khanate and some Moghulistan 's nobles supported his war against the Manchus, however, Inner Mongolian nobles did not battle against the Qing. There were three khans in Khalkha and Zasagt Khan Shar (Western Khalkha leader)
12397-587: The Oirats did not have the leading role due to their small population. Basmachis or Turkic and Tajik militants fought to liberate Soviet Central Asia until 1942. On February 2, 1913, the Treaty of friendship and alliance between the Government of Mongolia and Tibet was signed. Mongolian agents and Bogd Khan disrupted Soviet secret operations in Tibet to change its regime in the 1920s. On October 27, 1961,
12558-535: The Qing Empire). The Qing Empire transmigrated the Kalmyks to five different areas to prevent their revolt and influential leaders of the Kalmyks died soon (killed by the Manchus). Russia states that Buryatia voluntarily merged with Russia in 1659 due to Mongolian oppression and the Kalmyks voluntarily accepted Russian rule in 1609 but only Georgia voluntarily accepted Russian rule. In the early 20th century,
12719-577: The Qing dynasty in 1755–1758 because of their leaders and military commanders conflicts. Some scholars estimate that about 80% of the Dzungar population were destroyed by a combination of warfare and disease during the Qing conquest of the Dzungar Khanate in 1755–1758. Mark Levene, a historian whose recent research interests focus on genocide , has stated that the extermination of the Dzungars
12880-527: The Sun's apogee (highest point in the heavens) was mobile, not fixed. Some of the prominent Islamic (mostly Persian and Arab) astronomers who made significant contributions to the science include Al-Battani , Thebit , Abd al-Rahman al-Sufi , Biruni , Abū Ishāq Ibrāhīm al-Zarqālī , Al-Birjandi , and the astronomers of the Maragheh and Samarkand observatories. Astronomers during that time introduced many Arabic names now used for individual stars . It
13041-584: The Sun, the Moon and the stars rotating around it. This is known as the geocentric model of the Universe, or the Ptolemaic system , named after Ptolemy . A particularly important early development was the beginning of mathematical and scientific astronomy, which began among the Babylonians , who laid the foundations for the later astronomical traditions that developed in many other civilizations. The Babylonians discovered that lunar eclipses recurred in
13202-514: The Tsarist government imposed a council on the Kalmyk Khan, thereby diluting his authority, while continuing to expect the Kalmyk Khan to provide cavalry units to fight on behalf of Russia. The Russian Orthodox church , by contrast, pressured Buddhist Kalmyks to adopt Orthodoxy. In January 1771, approximately 200,000 (170,000) Kalmyks began the migration from their pastures on the left bank of
13363-485: The United Nations recognized Mongolian independence and granted the nation full membership in the organization. The powerful states of Russia and China have committed many abuses against Mongols in their homeland, including war crimes and crimes against humanity, sometimes characterized as cultural genocide , with targets among the Mongol language, culture, tradition, history, religion, and ethnic identity. Peter
13524-699: The Volga to Dzungaria, through the territories of their Bashkir and Kazakh enemies. The last Kalmyk khan Ubashi led the migration to restore Mongolian independence. Ubashi Khan sent his 30,000 cavalries to the Russo-Turkish War (1768–74) to gain weapon before the migration. The Empress Catherine the Great ordered the Russian army, Bashkirs and Kazakhs to exterminate all migrants and the Empress abolished
13685-689: The Xiongnu, killing 2000, after having received generous gifts from Emperor Guangwu of Han . The Xianbei reached their peak under Tanshihuai Khan (reigned 156–181) who expanded the vast, but short lived, Xianbei state (93–234). Three prominent groups split from the Xianbei state as recorded by the Chinese histories: the Rouran (claimed by some to be the Pannonian Avars ), the Khitan people and
13846-535: The age of the Universe and size of the Observable Universe. Theoretical astronomy led to speculations on the existence of objects such as black holes and neutron stars , which have been used to explain such observed phenomena as quasars , pulsars , blazars , and radio galaxies . Physical cosmology made huge advances during the 20th century. In the early 1900s the model of the Big Bang theory
14007-611: The anthology Verses of Chu mentions small-waisted and long-necked Xianbei women, and possibly also the book Discourses of the States , which states that during the reign of King Cheng of Zhou (reigned 1042–1021 BCE) the Xianbei came to participate at a meeting of Zhou subject-lords at Qiyang (岐阳) (now Qishan County ) but were only allowed to perform the fire ceremony under the supervision of Chu since they were not vassals (诸侯) by enfeoffment and establishment . The Xianbei chieftain
14168-642: The areas vacated by the Turkic Uyghurs bringing them under their control. The Yenisei Kirghiz state was centered on Khakassia and they were expelled from Mongolia by the Khitans in 924. Beginning in the 10th century, the Khitans, under the leadership of Abaoji , prevailed in several military campaigns against the Tang dynasty ' s border guards, and the Xi , Shiwei and Jurchen nomadic groups. Remnants of
14329-486: The atmosphere itself produces significant infrared emission. Consequently, infrared observatories have to be located in high, dry places on Earth or in space. Some molecules radiate strongly in the infrared. This allows the study of the chemistry of space; more specifically it can detect water in comets. Historically, optical astronomy, which has been also called visible light astronomy, is the oldest form of astronomy. Images of observations were originally drawn by hand. In
14490-401: The caliph to death, but there is no corroborating evidence for that. Most historians believe the Mongol and Muslim accounts that the caliph was rolled up in a rug and the Mongols rode their horses over him, as they believed that the earth would be offended if touched by royal blood. All but one of his sons were killed. Baghdad was a depopulated, ruined city for several centuries. Smaller states in
14651-650: The center of Islamic power shifted to the Mamluk sultan's capital of Cairo. Hulegu intended to send forces southward through Palestine toward Cairo. So he had a threatening letter delivered by an envoy to the Mamluk Sultan Qutuz in Cairo demanding that Qutuz open his city or it would be destroyed like Baghdad. Then, because food and fodder in Syria had become insufficient to supply his full force, and because it
14812-400: The country's 5.8 million ethnic Mongols (2005 estimate) However, the exact number of Mongolian speakers in China is unknown, as there is no data available on the language proficiency of that country's citizens. The use of Mongolian in China, specifically in Inner Mongolia, has witnessed periods of decline and revival over the last few hundred years. The language experienced a decline during
14973-602: The death of one of Kitbuqa's grandsons. Angered, Kitbuqa had sacked Sidon. The Barons of Acre, contacted by the Mongols, had also been approached by the Mamluks, seeking military assistance against the Mongols. Although the Mamluks were traditional enemies of the Franks, the Barons of Acre recognized the Mongols as the more immediate menace. Instead of taking sides, the Crusaders opted for a position of cautious neutrality between
15134-406: The death some eight months earlier of Great Khan Möngke . But upon receiving news of how few Mongols now remained in the region, Qutuz quickly assembled his well-trained and equipped 20,000-strong army at Cairo and invaded Palestine. He then allied himself with a fellow Mamluk leader, Baybars in Syria, who not only needed to protect his own future from the Mongols but was eager to avenge for Islam
15295-408: The department is historically affiliated with a physics department, and many professional astronomers have physics rather than astronomy degrees. Some titles of the leading scientific journals in this field include The Astronomical Journal , The Astrophysical Journal , and Astronomy & Astrophysics . In early historic times, astronomy only consisted of the observation and predictions of
15456-474: The detection of neutrinos . The vast majority of the neutrinos streaming through the Earth originate from the Sun , but 24 neutrinos were also detected from supernova 1987A . Cosmic rays , which consist of very high energy particles (atomic nuclei) that can decay or be absorbed when they enter the Earth's atmosphere, result in a cascade of secondary particles which can be detected by current observatories. Some future neutrino detectors may also be sensitive to
15617-516: The following month on the banks of Zarrineh River (then called Jaghatu) and was buried on Shahi Island in Lake Urmia . His funeral was the only Ilkhanate funeral to feature human sacrifice . His tomb has never been found. Hulegu Khan laid the foundations of the Ilkhanate and thus paved the way for the later Safavid dynastic state, and ultimately the modern country of Iran . Hulegu's conquests also opened Iran to both European influence from
15778-602: The government's new policy and Soviets. The government and Soviet soldiers defeated the rebels in October. The Buryats started to migrate to Mongolia in the 1900s due to Russian oppression. Joseph Stalin 's regime stopped the migration in 1930 and started a campaign of ethnic cleansing against newcomers and Mongolians. During the Stalinist repressions in Mongolia , almost all adult Buryat men and 22,000–33,000 Mongols (3–5% of
15939-403: The ground behind the caliph's army, trapping them. Much of the army was slaughtered or drowned. The Mongols under Chinese general Guo Kan laid siege to the city on 29 January 1258, constructing a palisade and a ditch and wheeling up siege engines and catapults . The battle was short by siege standards. By 5 February the Mongols controlled a stretch of the wall. The caliph tried to negotiate but
16100-592: The independence of Outer Mongolia, the Mongolian army controlled Khalkha and Khovd regions (modern day Uvs , Khovd , and Bayan-Ölgii provinces ), but Northern Xinjiang (the Altai and Ili regions of the Qing empire), Upper Mongolia , Barga and Inner Mongolia came under control of the newly formed Republic of China . On February 2, 1913, the Bogd Khanate of Mongolia sent Mongolian cavalries to "liberate" Inner Mongolia from China. Russia refused to sell weapons to
16261-414: The introduction of new technology, including the spectroscope and photography . Joseph von Fraunhofer discovered about 600 bands in the spectrum of the Sun in 1814–15, which, in 1859, Gustav Kirchhoff ascribed to the presence of different elements. Stars were proven to be similar to the Earth's own Sun, but with a wide range of temperatures , masses , and sizes. The existence of the Earth's galaxy,
16422-579: The late 19th century and most of the 20th century, images were made using photographic equipment. Modern images are made using digital detectors, particularly using charge-coupled devices (CCDs) and recorded on modern medium. Although visible light itself extends from approximately 4000 Å to 7000 Å (400 nm to 700 nm), that same equipment can be used to observe some near-ultraviolet and near-infrared radiation. Ultraviolet astronomy employs ultraviolet wavelengths between approximately 100 and 3200 Å (10 to 320 nm). Light at those wavelengths
16583-614: The late Qing government encouraged Han Chinese settlement of Mongolian lands under the name of " New Policies " or "New Administration" (xinzheng). As a result, some Mongol leaders, especially those of Outer Mongolia, decided to seek Mongolian independence. After the Xinhai Revolution , the Mongolian Revolution on 30 November 1911 in Outer Mongolia ended an over 200-year rule of the Qing dynasty. With
16744-403: The late Qing period, a revival between 1947 and 1965, a second decline between 1966 and 1976, a second revival between 1977 and 1992, and a third decline between 1995 and 2012. However, in spite of the decline of the Mongolian language in some of Inner Mongolia's urban areas and educational spheres, the ethnic identity of the urbanized Chinese-speaking Mongols is most likely going to survive due to
16905-576: The making of calendars . Professional astronomy is split into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects. This data is then analyzed using basic principles of physics. Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. These two fields complement each other. Theoretical astronomy seeks to explain observational results and observations are used to confirm theoretical results. Astronomy
17066-593: The motions of objects visible to the naked eye. In some locations, early cultures assembled massive artifacts that may have had some astronomical purpose. In addition to their ceremonial uses, these observatories could be employed to determine the seasons, an important factor in knowing when to plant crops and in understanding the length of the year. As civilizations developed, most notably in Egypt , Mesopotamia , Greece , Persia , India , China , and Central America , astronomical observatories were assembled and ideas on
17227-417: The motions of the planets. Newton also developed the reflecting telescope . Improvements in the size and quality of the telescope led to further discoveries. The English astronomer John Flamsteed catalogued over 3000 stars. More extensive star catalogues were produced by Nicolas Louis de Lacaille . The astronomer William Herschel made a detailed catalog of nebulosity and clusters, and in 1781 discovered
17388-406: The nature of the Universe began to develop. Most early astronomy consisted of mapping the positions of the stars and planets, a science now referred to as astrometry . From these observations, early ideas about the motions of the planets were formed, and the nature of the Sun, Moon and the Earth in the Universe were explored philosophically. The Earth was believed to be the center of the Universe with
17549-494: The observation of young stars embedded in molecular clouds and the cores of galaxies. Observations from the Wide-field Infrared Survey Explorer (WISE) have been particularly effective at unveiling numerous galactic protostars and their host star clusters . With the exception of infrared wavelengths close to visible light, such radiation is heavily absorbed by the atmosphere, or masked, as
17710-553: The particles produced when cosmic rays hit the Earth's atmosphere. Gravitational-wave astronomy is an emerging field of astronomy that employs gravitational-wave detectors to collect observational data about distant massive objects. A few observatories have been constructed, such as the Laser Interferometer Gravitational Observatory LIGO . LIGO made its first detection on 14 September 2015, observing gravitational waves from
17871-497: The planet Uranus , the first new planet found. During the 18–19th centuries, the study of the three-body problem by Leonhard Euler , Alexis Claude Clairaut , and Jean le Rond d'Alembert led to more accurate predictions about the motions of the Moon and planets. This work was further refined by Joseph-Louis Lagrange and Pierre Simon Laplace , allowing the masses of the planets and moons to be estimated from their perturbations. Significant advances in astronomy came about with
18032-470: The planets with great accuracy, a field known as celestial mechanics . More recently the tracking of near-Earth objects will allow for predictions of close encounters or potential collisions of the Earth with those objects. The measurement of stellar parallax of nearby stars provides a fundamental baseline in the cosmic distance ladder that is used to measure the scale of the Universe. Parallax measurements of nearby stars provide an absolute baseline for
18193-595: The plough in Middle Mongol language sources appear towards the end of the 14th c. In 1434, Eastern Mongol Taisun Khan 's (1433–1452) Oirat prime minister Togoon Taish reunited the Mongols after killing Adai Khan in Khorchin . Togoon died in 1439 and his son Esen Taish became ruler of Northern Yuan dynasty. Esen later unified the Mongol tribes. The Ming dynasty attempted to invade the Northern Yuan in
18354-425: The point that the outcome was inevitable. Refusing to surrender, the whole Mongol army that had remained in the region, including Kitbuqa , were cut down and killed that day. The battle of Ain Jalut established a high-water mark for the Mongol conquest. After the succession was settled and his brother Kublai Khan was established as Great Khan, Hulegu returned to his lands by 1262. When he massed his armies to attack
18515-595: The population of Mongolia is only hundred thousands". The proportion of victims in relation to the population of the country is much higher than the corresponding figures of the Great Purge in the Soviet Union. The Manchukuo (1932–1945), puppet state of the Empire of Japan (1868–1947) invaded Barga and some part of Inner Mongolia with Japanese help. The Mongolian army advanced to the Great Wall of China during
18676-596: The pre-colonial Middle Ages, but modern discoveries show otherwise. For over six centuries (from the recovery of ancient learning during the late Middle Ages into the Enlightenment), the Roman Catholic Church gave more financial and social support to the study of astronomy than probably all other institutions. Among the Church's motives was finding the date for Easter . Medieval Europe housed
18837-610: The presence of urban ethnic communities. The multilingual situation in Inner Mongolia does not appear to obstruct efforts by ethnic Mongols to preserve their language. Although an unknown number of Mongols in China, such as the Tumets, may have completely or partially lost the ability to speak their language, they are still registered as ethnic Mongols and continue to identify themselves as ethnic Mongols. The children of inter-ethnic Mongol-Chinese marriages also claim to be and are registered as ethnic Mongols. Astronomy Astronomy
18998-526: The present-day Xianbei (鮮卑). Again in Inner Mongolia another closely connected core Mongolic Xianbei region was the Upper Xiajiadian culture (1000–600 BCE) where the Donghu confederation was centered. After the Donghu were defeated by Xiongnu king Modu Chanyu , the Xianbei and Wuhuan survived as the main remnants of the confederation. Tadun Khan of the Wuhuan (died 207 AD) was the ancestor of
19159-456: The principal member of the large family of Mongolic peoples . The Oirats and the Buryats are classified either as distinct ethno-linguistic groups or subgroups of Mongols. The Mongols are bound together by a common heritage and ethnic identity . Their indigenous dialects are collectively known as the Mongolian language . The contiguous geographical area in which the Mongols primarily live
19320-458: The properties examined include luminosity , density , temperature , and chemical composition. Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines of physics, including mechanics , electromagnetism , statistical mechanics , thermodynamics , quantum mechanics , relativity , nuclear and particle physics , and atomic and molecular physics . In practice, modern astronomical research often involves
19481-473: The properties of more distant stars, as their properties can be compared. Measurements of the radial velocity and proper motion of stars allow astronomers to plot the movement of these systems through the Milky Way galaxy. Astrometric results are the basis used to calculate the distribution of speculated dark matter in the galaxy. During the 1990s, the measurement of the stellar wobble of nearby stars
19642-464: The proto-Mongolic Kumo Xi . The Wuhuan are of the direct Donghu royal line and the New Book of Tang says that in 209 BCE, Modu Chanyu defeated the Wuhuan instead of using the word Donghu. The Xianbei, however, were of the lateral Donghu line and had a somewhat separate identity, although they shared the same language with the Wuhuan. In 49 CE the Xianbei ruler Bianhe (Bayan Khan?) raided and defeated
19803-459: The question of whether extraterrestrial life exists, and how humans can detect it if it does. The term exobiology is similar. Astrobiology makes use of molecular biology , biophysics , biochemistry , chemistry , astronomy, physical cosmology , exoplanetology and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from that on Earth. The origin and early evolution of life
19964-459: The region hastened to reassure Hulegu of their loyalty, and the Mongols turned to Syria in 1259, conquering the Ayyubid dynasty and sending advance patrols as far ahead as Gaza . A thousand squads of northern Chinese sappers accompanied Hulegu during his conquest of the Middle East. In 1260 Mongol forces combined with those of their Christian vassals in the region, including the army of
20125-509: The reign of Dayan Khan (1479–1543) as one of the six tumens of the Eastern Mongolic peoples. They quickly became the dominant Mongolic clan in Mongolia proper. He reunited the Mongols again. In 1550, Altan Khan led a Khalkha Mongol raid on Beijing. The Mongols voluntarily reunified during Eastern Mongolian Tümen Zasagt Khan rule (1558–1592) for the last time (the Mongol Empire united all Mongols before this). Eastern Mongolia
20286-728: The rise of the First Turkic Khaganate in 555, the Uyghur Khaganate in 745 and the Yenisei Kirghiz states in 840. The Tuoba were eventually absorbed into China. The Rouran fled west from the Göktürks and either disappeared into obscurity or, as some say, invaded Europe as the Avars under their Khan, Bayan I . Some Rouran under Tatar Khan migrated east, founding the Tatar confederation , who became part of
20447-425: The rotation of the Earth, furthermore, Buridan also developed the theory of impetus (predecessor of the modern scientific theory of inertia ) which was able to show planets were capable of motion without the intervention of angels. Georg von Peuerbach (1423–1461) and Regiomontanus (1436–1476) helped make astronomical progress instrumental to Copernicus's development of the heliocentric model decades later. During
20608-624: The rule of Genghis Khan . There are several proposals for the ethnonym Mongol's etymology: In various times Mongolic peoples have been equated with the Scythians , the Magog , and the Tungusic peoples . Based on Chinese historical texts the ancestry of the Mongolic peoples can be traced back to the Donghu , a nomadic confederation occupying eastern Mongolia and Manchuria . The Donghu neighboured
20769-399: The rule of Galdan Boshugtu Khaan until 1696. The Mongol-Oirat's Code (a treaty of alliance) against foreign invasion between the Oirats and Khalkhas was signed in 1640, however, the Mongols could not unite against foreign invasions. Chakhundorj fought against Russian invasion of Outer Mongolia until 1688 and stopped Russian invasion of Khövsgöl Province . Zanabazar struggled to bring together
20930-551: The sides of Lake Baikal were separated from Mongolia. In 1689 the Treaty of Nerchinsk established the northern border of Manchuria north of the present line. The Russians retained Trans-Baikalia between Lake Baikal and the Argun River north of Mongolia. The Treaty of Kyakhta (1727) , along with the Treaty of Nerchinsk, regulated the relations between Russian and Qing empires until the mid-nineteenth century, and established
21091-436: The stars" depending on the translation). Astronomy should not be confused with astrology , the belief system which claims that human affairs are correlated with the positions of celestial objects. Although the two fields share a common origin, they are now entirely distinct. "Astronomy" and " astrophysics " are synonyms. Based on strict dictionary definitions, "astronomy" refers to "the study of objects and matter outside
21252-553: The strands lower on both sides they plait to hang down on the shoulders. With the breakup of the empire, the dispersed Mongolic peoples quickly adopted the mostly Turkic cultures surrounding them and were assimilated, forming parts of Afghanistan's Hazaras , Azerbaijanis , Uzbeks , Karakalpaks , Tatars , Bashkirs , Turkmens , Uyghurs , Nogays , Kyrgyzs , Kazakhs , Caucasus peoples , Iranian peoples and Moghuls ; linguistic and cultural Persianization also began to be prominent in these territories. Some Mongols assimilated into
21413-477: The subject, whereas "astrophysics" is used to describe the physics-oriented version of the subject. However, since most modern astronomical research deals with subjects related to physics, modern astronomy could actually be called astrophysics. Some fields, such as astrometry , are purely astronomy rather than also astrophysics. Various departments in which scientists carry out research on this subject may use "astronomy" and "astrophysics", partly depending on whether
21574-550: The submission or destruction of the Bahri Mamluke Sultanate of Egypt. Möngke ordered Hulegu to treat kindly those who submitted and utterly destroy those who did not. Hulegu vigorously carried out the latter part of these instructions. Hulegu marched out with perhaps the largest Mongol army ever assembled – by order of Möngke, two-tenths of the empire's fighting men were gathered for Hulegu's army in 1253. He arrived at Transoxiana in 1255. He easily destroyed
21735-681: The three Christian rulers Hethum, Bohemond, and Kitbuqa entering the city of Damascus together in triumph, though some modern historians such as David Morgan have questioned this story as apocryphal . The invasion effectively destroyed the Ayyubids, which was until then a powerful dynasty that had ruled large parts of the Levant , Egypt , and the Arabian Peninsula . The last Ayyubid king, An-Nasir Yusuf , had been killed by Hulegu this same year. With Baghdad ravaged and Damascus weakened,
21896-501: The total population; common citizens, monks, Pan-Mongolists, nationalists, patriots, hundreds of military officers, nobles, intellectuals and elite people) were shot dead under Soviet orders. Some authors also offer much higher estimates, up to 100,000 victims. Around the late 1930s the Mongolian People's Republic had an overall population of about 700,000 to 900,000 people. By 1939, Soviet said "We repressed too many people,
22057-510: The trail of the fleeing Egyptians. When the Mongols reached the highlands, Egyptians appeared from hiding, and the Mongols found themselves surrounded by enemy forces as the hidden troops hit them from the sides and Qutuz attacked the Mongol rear. Estimates of the size of the Egyptian army range from 24,000 to 120,000. The Mongols broke free of the trap and even mounted a temporarily successful counterattack, but their numbers had been depleted to
22218-656: The two forces. In an unusual move, however, they allowed the Egyptian Mamluks to march northward without hindrance through Crusader territory and even let them camp near Acre to resupply. When news arrived that the Mongols had crossed the Jordan River in 1260, Sultan Qutuz and his forces proceeded southeast toward the 'Spring of Goliath' (Known in Arabic as 'Ain Jalut') in the Jezreel Valley . They met
22379-548: The universe consists of a multitude of galaxies. With this Hubble formulated the Hubble constant , which allowed for the first time a calculation of the age of the Universe and size of the Observable Universe, which became increasingly precise with better meassurements, starting at 2 billion years and 280 million light-years, until 2006 when data of the Hubble Space Telescope allowed a very accurate calculation of
22540-469: The universe; origin of cosmic rays ; general relativity and physical cosmology , including string cosmology and astroparticle physics . Astrochemistry is the study of the abundance and reactions of molecules in the Universe , and their interaction with radiation . The discipline is an overlap of astronomy and chemistry . The word "astrochemistry" may be applied to both the Solar System and
22701-476: The war. Few Khalkhas fled to the Buryat region and Russia threatened to exterminate them if they did not submit, but many of them submitted to Galdan Boshugtu. In 1683 Galdan 's armies reached Tashkent and the Syr Darya and crushed two armies of the Kazakhs . After that Galdan subjugated the Black Khirgizs and ravaged the Fergana Valley . From 1685 Galdan's forces aggressively pushed the Kazakhs. While his general Rabtan took Taraz , and his main force forced
22862-535: The west and buddhist influence from the east. Thus, combined with patronage from his successors, would develop Iran's distinctive excellence in architecture. Under Hulegu's dynasty, Iranian historians began writing in Persian rather than Arabic. It is recorded however that he converted to Buddhism as he neared death, against the will of Doquz Khatun . The erection of a Buddhist temple at Ḵoy testifies his interest in that religion. Recent translations of various Tibetan monks' letters and epistles to Hulegu confirms that he
23023-405: The world." But the economic situation of the Golden Horde due to the actions of the Ilkhanate led him to declare jihad because the Ilkhanids were hogging the wealth of North Iran and because of the Ilkhanate's demands for the Golden Horde not to sell slaves to the Mamluks. Hulegu's mother Sorghaghtani successfully navigated Mongol politics, arranging for all of her sons to become Mongol leaders. She
23184-640: Was used to detect large extrasolar planets orbiting those stars. Theoretical astronomers use several tools including analytical models and computational numerical simulations ; each has its particular advantages. Analytical models of a process are better for giving broader insight into the heart of what is going on. Numerical models reveal the existence of phenomena and effects otherwise unobserved. Theorists in astronomy endeavor to create theoretical models that are based on existing observations and known physics, and to predict observational consequences of those models. The observation of phenomena predicted by
23345-420: Was "arguably the eighteenth century genocide par excellence." The Dzungar population reached 600,000 in 1755. About 200,000–250,000 Oirats migrated from western Mongolia to Volga River in 1607 and established the Kalmyk Khanate .The Torghuts were led by their Tayishi, Kho Orluk . Russia was concerned about their attack but the Kalmyks became a Russian ally and a treaty to protect the southern Russian border
23506-400: Was Galdan's ally. Tsetsen Khan (Eastern Khalkha leader) did not engage in this conflict. While Galdan was fighting in Eastern Mongolia, his nephew Tseveenravdan seized the Dzungarian throne in 1689 and this event made Galdan impossible to fight against the Qing Empire. The Russian and Qing Empires supported his action because this coup weakened Western Mongolian strength. Galdan Boshugtu's army
23667-471: Was a Christian of the Church of the East (often referred to as "Nestorianism") and Hulegu was friendly to Christianity . Hulegu's favorite wife, Doquz Khatun , was also a Christian, as was his closest friend and general, Kitbuqa . Hulegu sent multiple communications to Europe in an attempt to establish a Franco-Mongol alliance against the Muslims. In 1262, he sent his secretary Rychaldus and an embassy to "all kings and princes overseas". The embassy
23828-541: Was a lifelong Buddhist, following the Kagyu school . Hulegu also patronized Nasir al-Din Tusi and his researches in Maragheh observatory . Another of his proteges were Juvayni brothers Ata Malik and Shams al-Din Juvayni . His reign as the ruler of Ilkhanate was peaceful and tolerant to diversity. Mongols The Mongols are an East Asian ethnic group native to Mongolia , China ( Inner Mongolia and other 11 autonomous territories ), as well as Buryatia and Kalmykia republics of Russia . The Mongols are
23989-584: Was a part of a Pan-Mongolian plan and few Oirats and Inner Mongols ( Huuchids , Bargas, Tümeds , about 800 Uzemchins ) arrived . Inner Mongolian leaders carried out active policy to merge Inner Mongolia with Mongolia since 1911. They founded the Inner Mongolian Army in 1929 but the Inner Mongolian Army disbanded after ending World War II. The Japanese Empire supported Pan-Mongolism since the 1910s but there have never been active relations between Mongolia and Imperial Japan due to Russian resistance. The nominally independent Inner Mongolian Mengjiang state (1936–1945)
24150-411: Was a regular Mongol practice to move troops to the cooler highlands for the summer, Hulegu withdrew his main force to Iran near Azerbaijan, leaving behind one tumen (10,000 men or less) under Kitbuqa , accompanied by Armenian, Georgian, and Frankish volunteers, which Hulegu considered sufficient. Hulegu then personally departed for Mongolia to play his role in the imperial succession conflict occasioned by
24311-412: Was an early analog computer designed to calculate the location of the Sun , Moon , and planets for a given date. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe. Astronomy flourished in the Islamic world and other parts of the world. This led to the emergence of the first astronomical observatories in
24472-411: Was apparently intercepted in Sicily by Manfred, King of Sicily , who was allied with the Mamluk Sultanate and in conflict with Pope Urban IV , and Rychaldus was returned by ship. On 10 April 1262, Hulegu sent a letter, through John the Hungarian , to Louis IX of France , offering an alliance. It is unclear whether the letter ever reached Louis IX in Paris – the only manuscript known to have survived
24633-583: Was appointed joint guardian of the ritual torch along with Chu viscount Xiong Yi . These early Xianbei came from the nearby Zhukaigou culture (2200–1500 BCE) in the Ordos Desert , where maternal DNA corresponds to the Mongol Daur people and the Tungusic Evenks . The Zhukaigou Xianbei (part of the Ordos culture of Inner Mongolia and northern Shaanxi ) had trade relations with the Shang. Liu Song dynasty commentator Pei Yin (裴駰), in his Jixie (集解), quoted Eastern Han dynasty scholar Fu Qian (服虔)'s assertion that Shanrong (山戎) and Beidi (北狄) are ancestors of
24794-409: Was defeated by the outnumbering Qing army in 1696 and he died in 1697. The Mongols who fled to the Buryat region and Inner Mongolia returned after the war. Some Khalkhas mixed with the Buryats. The Buryats fought against Russian invasion since the 1620s and thousands of Buryats were massacred. The Buryat region was formally annexed to Russia by treaties in 1689 and 1727, when the territories on both
24955-433: Was divided into three parts in the 17th century: Outer Mongolia (Khalkha), Inner Mongolia (Inner Mongols) and the Buryat region in southern Siberia . The last Mongol khagan was Ligdan in the early 17th century. He got into conflicts with the Manchus over the looting of Chinese cities, and managed to alienate most Mongol tribes. In 1618, Ligdan signed a treaty with the Ming dynasty to protect their northern border from
25116-513: Was established with support of Japan in 1936; also, some Buryat and Inner Mongol nobles founded a Pan-Mongolist government with the support of Japan in 1919. The Inner Mongols established the short-lived Republic of Inner Mongolia in 1945. Another part of Choibalsan's plan was to merge Inner Mongolia and Dzungaria with Mongolia. By 1945, Chinese communist leader Mao Zedong requested the Soviets to stop Pan-Mongolism because China lost its control over Inner Mongolia and without Inner Mongolian support
25277-486: Was formulated, heavily evidenced by cosmic microwave background radiation , Hubble's law , and the cosmological abundances of elements . Space telescopes have enabled measurements in parts of the electromagnetic spectrum normally blocked or blurred by the atmosphere. In February 2016, it was revealed that the LIGO project had detected evidence of gravitational waves in the previous September. The main source of information about celestial bodies and other objects
25438-407: Was in Vienna , Austria. The letter stated Hulegu's intention to capture Jerusalem for the benefit of the Pope and asked for Louis to send a fleet against Egypt: From the head of the Mongol army, anxious to devastate the perfidious nation of the Saracens, with the good-will support of the Christian faith (...) so that you, who are the rulers of the coasts on the other side of the sea, endeavor to deny
25599-432: Was refused. On 10 February Baghdad surrendered. The Mongols swept into the city on 13 February and began a week of destruction. The Grand Library of Baghdad , containing countless precious historical documents and books on subjects ranging from medicine to astronomy , was destroyed. Citizens attempted to flee but were intercepted by Mongol soldiers. Death counts vary widely and cannot be easily substantiated: A low estimate
25760-456: Was signed between the Kalmyk Khanate and Russia. In 1724 the Kalmyks came under control of Russia. By the early 18th century, there were approximately 300,000–350,000 Kalmyks and 15,000,000 Russians. The Tsardom of Russia gradually chipped away at the autonomy of the Kalmyk Khanate. These policies, for instance, encouraged the establishment of Russian and German settlements on pastures the Kalmyks used to roam and feed their livestock. In addition,
25921-560: Was to find allies to defeat the Soviet Union . The Statement of Reunification of Mongolia was adopted by Mongolian revolutionaries in 1921. The Soviet, however, considered Mongolia to be Chinese territory in 1924 during a secret meeting with the Republic of China. However, the Soviets officially recognized Mongolian independence in 1945 but carried out various policies (political, economic and cultural) against Mongolia until its fall in 1991 to prevent Pan-Mongolism and other irredentist movements . On 10 April 1932, Mongolians revolted against
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