149-578: The overwhelming majority of fiction is set on or features the Earth , as the only planet home to humans or known to have life . This also holds true of science fiction , despite perceptions to the contrary. Works that focus specifically on Earth may do so holistically , treating the planet as one semi-biological entity. Counterfactual depictions of the shape of the Earth , be it flat or hollow , are occasionally featured. A personified, living Earth appears in
298-540: A circumstellar disk , and then the planets grow out of that disk with the Sun. A nebula contains gas, ice grains, and dust (including primordial nuclides ). According to nebular theory , planetesimals formed by accretion , with the primordial Earth being estimated as likely taking anywhere from 70 to 100 million years to form. Estimates of the age of the Moon range from 4.5 Ga to significantly younger. A leading hypothesis
447-592: A hypothetical body of the Solar System that orbits on the other side of the solar system from Earth. Many stories portray Earth as known to modern science, but the exploration of its subterrean depths , relatively consistent with the knowledge of modern geology, is still subject to a number of works. Brian Stableford listed among "notable accounts of burrowing expeditions" into such an Earth works such as Harry Harrison 's " Rock Diver " (1951). Large scale planetary engineering includes ideas such as adjusting
596-678: A 21st-century murder investigation. Doyle was the doctor on the Greenland whaler Hope of Peterhead in 1880. On 11 July 1880, John Gray's Hope and David Gray's Eclipse met up with the Eira and Leigh Smith . The photographer W. J. A. Grant took a photograph aboard the Eira of Doyle along with Smith, the Gray brothers, and ship's surgeon William Neale, who were members of the Smith expedition. That expedition explored Franz Josef Land , and led to
745-490: A Parisian in the 21st Century", 1910) by Octave Béliard [ fr ] . In general, the vast majority of fiction, including science fiction, takes place on Earth. To the extent that Earth is more than the obvious but forgettable background where the action of the story takes place, a number of themes have been identified. Many works of science fiction focus on the outer space , but many others still take place on Earth; this distinction has been subject to debates among
894-578: A book on the war, The Great Boer War , as well as a short work titled The War in South Africa: Its Cause and Conduct , in which he responded to critics of the United Kingdom's role in that war, and argued that its role was justified. The latter work was widely translated, and Doyle believed it was the reason he was knighted (given the rank of Knight Bachelor ) by King Edward VII in the 1902 Coronation Honours . He received
1043-492: A common barycenter every 27.32 days relative to the background stars. When combined with the Earth–Moon system's common orbit around the Sun, the period of the synodic month , from new moon to new moon, is 29.53 days. Viewed from the celestial north pole , the motion of Earth, the Moon, and their axial rotations are all counterclockwise . Viewed from a vantage point above the Sun and Earth's north poles, Earth orbits in
1192-517: A contemporaneous report by the Sunday Express quoted Doyle as saying "I should have to see it again before passing a definite opinion on it" and "I have my doubts about the whole thing". In 1920, Doyle and the noted sceptic Joseph McCabe held a public debate at Queen's Hall in London, with Doyle taking the position that the claims of spiritualism were true. After the debate, McCabe published
1341-548: A counterclockwise direction about the Sun. The orbital and axial planes are not precisely aligned: Earth's axis is tilted some 23.44 degrees from the perpendicular to the Earth–Sun plane (the ecliptic ), and the Earth-Moon plane is tilted up to ±5.1 degrees against the Earth–Sun plane. Without this tilt, there would be an eclipse every two weeks, alternating between lunar eclipses and solar eclipses . The Hill sphere , or
1490-420: A full rotation about its axis so that the Sun returns to the meridian . The orbital speed of Earth averages about 29.78 km/s (107,200 km/h; 66,600 mph), which is fast enough to travel a distance equal to Earth's diameter, about 12,742 km (7,918 mi), in seven minutes, and the distance from Earth to the Moon, 384,400 km (238,900 mi), in about 3.5 hours. The Moon and Earth orbit
1639-421: A globe-spanning mid-ocean ridge system. At Earth's polar regions , the ocean surface is covered by seasonally variable amounts of sea ice that often connects with polar land, permafrost and ice sheets , forming polar ice caps . Earth's land covers 29.2%, or 149 million km (58 million sq mi) of Earth's surface. The land surface includes many islands around the globe, but most of
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#17327834032411788-670: A goalkeeper for Portsmouth Association Football Club , an amateur side, under the pseudonym A. C. Smith. Doyle was a keen cricketer, and between 1899 and 1907 he played 10 first-class matches for the Marylebone Cricket Club (MCC). He also played for the amateur cricket teams the Allahakbarries and the Authors XI alongside fellow writers J. M. Barrie , P. G. Wodehouse and A. A. Milne . His highest score, in 1902 against London County ,
1937-792: A handful of works. In works set in the far future , Earth can be a center of space-faring human civilization, or just one of many inhabited planets of a galactic empire , and sometimes destroyed by ecological disaster or nuclear war or otherwise forgotten or lost. In a number of works of science fiction, Earth's English name has become less popular, and the planet is instead known as Terra or Tellus, Latin words for Earth. Inhabitants of Earth can be referred to as Earthlings, Earthers, Earthborn, Earthfolk, Earthians, Earthies (this term being often seen as derogatory ), Earthmen (and Earthwomen), Earthpersons, Earthsiders, Solarians, Tellurians, Terrestrials, Terrestrians, or Terrans. In addition, science fiction vocabulary includes terms like Earthfall for landing of
2086-509: A level intended to discourage them, but found they were willing to pay even the large sums he asked. As a result, he became one of the best-paid authors of his time. In December 1893, to dedicate more of his time to his historical novels, Doyle had Holmes and Professor Moriarty plunge to their deaths together down the Reichenbach Falls in the story " The Final Problem ". Public outcry, however, led him to feature Holmes in 1901 in
2235-425: A liquid outer core that generates a magnetosphere capable of deflecting most of the destructive solar winds and cosmic radiation . Earth has a dynamic atmosphere , which sustains Earth's surface conditions and protects it from most meteoroids and UV-light at entry . It has a composition of primarily nitrogen and oxygen . Water vapor is widely present in the atmosphere, forming clouds that cover most of
2384-668: A man", and in his 1924 autobiography, he remarked, "It is no wonder that after the study of such a character [viz., Bell] I used and amplified his methods when in later life I tried to build up a scientific detective who solved cases on his own merits and not through the folly of the criminal." Robert Louis Stevenson was able to recognise the strong similarity between Joseph Bell and Sherlock Holmes: "My compliments on your very ingenious and very interesting adventures of Sherlock Holmes. ... can this be my old friend Joe Bell?" Other authors sometimes suggest additional influences—for instance, Edgar Allan Poe 's character C. Auguste Dupin , who
2533-531: A medical practice at 1 Bush Villas in Elm Grove, Southsea . The practice was not successful. While waiting for patients, Doyle returned to writing fiction. Doyle was a staunch supporter of compulsory vaccination and wrote several articles advocating the practice and denouncing the views of anti-vaccinators . In early 1891, Doyle embarked on the study of ophthalmology in Vienna. He had previously studied at
2682-518: A member of the Portsmouth Literary and Philosophical Society, Doyle began a series of investigations into the possibility of psychic phenomena and attended about 20 seances, experiments in telepathy, and sittings with mediums. Writing to spiritualist journal Light that year, he declared himself to be a spiritualist, describing one particular event that had convinced him psychic phenomena were real. Also in 1887 (on 26 January), he
2831-531: A platonic relationship with her while his first wife was still alive, out of loyalty to her. Most of Doyle's family including his mother were aware of the relationship, but it appears to have remained unknown to Louisa. Jean outlived her husband and died during wartime on 27 June 1940. Doyle fathered five children. He had two with his first wife: Mary Louise (1889–1976) and Arthur Alleyne Kingsley, known as Kingsley (1892–1918). He had an additional three with his second wife: Denis Percy Stewart (1909–1955), who became
2980-694: A search for poltergeists in Devon. Doyle was also a member of the Hermetic Order of the Golden Dawn . Doyle and the spiritualist William Thomas Stead (who would die on the Titanic ) were led to believe that Julius and Agnes Zancig had genuine psychic powers, and they claimed publicly that the Zancigs used telepathy . However, in 1924, the Zancigs confessed that their mind reading act had been
3129-420: A spaceship on planet Earth; or Earth-type , Earthlike, Earthnorm(al) and terrestrial for the concept of "resembling planet Earth or conditions on it". The concept of modifying planets to be more Earth-like is known as terraforming . The concept of terraforming developed from both science fiction and actual science . In science, Carl Sagan , an astronomer , proposed the terraforming of Venus in 1961, which
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#17327834032413278-604: A topic in its own right," this has not prevented some writers from engaging with said topic. Some works that focus on Earth as an entity have been influenced by holistic , "big picture" concepts such as the Gaia hypothesis , noosphere and the Omega Point , and the popularizing of the photography of Earth from space . Others works have addressed the concept of Earth as a Goddess Gaia (from Greek mythology ; another prominent goddess of Earth whose name influenced science fiction
3427-501: A trick; they published the secret code and all other details of the trick method they had used under the title "Our Secrets!!" in a London newspaper. Doyle also praised the psychic phenomena and spirit materialisations that he believed had been produced by Eusapia Palladino and Mina Crandon , both of whom were also later exposed as frauds. In 1916, at the height of the First World War, Doyle's belief in psychic phenomena
3576-453: Is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System . Of the four rocky planets , it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it , taking a year (about 365.25 days) to complete one revolution. Earth rotates around its own axis in slightly less than a day (in about 23 hours and 56 minutes). Earth's axis of rotation
3725-456: Is a chemically distinct silicate solid crust, which is underlain by a highly viscous solid mantle. The crust is separated from the mantle by the Mohorovičić discontinuity . The thickness of the crust varies from about 6 kilometres (3.7 mi) under the oceans to 30–50 km (19–31 mi) for the continents. The crust and the cold, rigid, top of the upper mantle are collectively known as
3874-524: Is a mostly forgotten backwards world. In Clifford D. Simak 's Cemetery World (1973) Earth is a planet-size cemetery and in Gordon R. Dickson 's Call Him Lord (1966), a museum. At its extreme, in some settings, knowledge of Earth has been simply lost, making it a mythological place, whose existence is questioned by the few who even know the legends about it. In some of these works, a major plotline can involve future civilizations or intrepid explorers seeking
4023-483: Is approximately 9.8 m/s (32 ft/s ). Local differences in topography, geology, and deeper tectonic structure cause local and broad regional differences in Earth's gravitational field, known as gravity anomalies . The main part of Earth's magnetic field is generated in the core, the site of a dynamo process that converts the kinetic energy of thermally and compositionally driven convection into electrical and magnetic field energy. The field extends outwards from
4172-649: Is considered one of the first accounts of the concept. The term itself, however, was coined by Jack Williamson in a science-fiction short story (" Collision Orbit ") published in 1942 in Astounding Science Fiction , although the concept of terraforming in popular culture predates this work; for example, the idea of turning the Moon into a habitable environment with atmosphere was already present in La Journée d'un Parisien au XXI siècle ("A Day of
4321-529: Is contained in 3.45 billion-year-old Australian rocks showing fossils of microorganisms . During the Neoproterozoic , 1000 to 539 Ma , much of Earth might have been covered in ice. This hypothesis has been termed " Snowball Earth ", and it is of particular interest because it preceded the Cambrian explosion , when multicellular life forms significantly increased in complexity. Following
4470-457: Is farthest out from its center of mass at its equatorial bulge, the summit of the volcano Chimborazo in Ecuador (6,384.4 km or 3,967.1 mi) is its farthest point out. Parallel to the rigid land topography the ocean exhibits a more dynamic topography . To measure the local variation of Earth's topography, geodesy employs an idealized Earth producing a geoid shape. Such a shape
4619-516: Is gained if the ocean is idealized, covering Earth completely and without any perturbations such as tides and winds. The result is a smooth but irregular geoid surface, providing a mean sea level (MSL) as a reference level for topographic measurements. Earth's surface is the boundary between the atmosphere, and the solid Earth and oceans. Defined in this way, it has an area of about 510 million km (197 million sq mi). Earth can be divided into two hemispheres : by latitude into
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4768-482: Is land, most of which is located in the form of continental landmasses within Earth's land hemisphere . Most of Earth's land is at least somewhat humid and covered by vegetation , while large sheets of ice at Earth's polar deserts retain more water than Earth's groundwater , lakes, rivers and atmospheric water combined. Earth's crust consists of slowly moving tectonic plates , which interact to produce mountain ranges, volcanoes , and earthquakes. Earth has
4917-426: Is liquid under normal atmospheric pressure. Differences in the amount of captured energy between geographic regions (as with the equatorial region receiving more sunlight than the polar regions) drive atmospheric and ocean currents , producing a global climate system with different climate regions , and a range of weather phenomena such as precipitation , allowing components such as nitrogen to cycle . Earth
5066-730: Is mentioned, disparagingly, by Holmes in A Study in Scarlet . Dr. (John) Watson owes his surname, but not any other obvious characteristic, to a Portsmouth medical colleague of Doyle's, Dr. James Watson. A sequel to A Study in Scarlet was commissioned, and The Sign of the Four appeared in Lippincott's Magazine in February 1890, under agreement with the Ward Lock company. Doyle felt grievously exploited by Ward Lock as an author new to
5215-513: Is now slightly longer than it was during the 19th century due to tidal deceleration , each day varies between 0 and 2 ms longer than the mean solar day. Earth's rotation period relative to the fixed stars , called its stellar day by the International Earth Rotation and Reference Systems Service (IERS), is 86,164.0989 seconds of mean solar time ( UT1 ), or 23 56 4.0989 . Earth's rotation period relative to
5364-572: Is rare, though the alternative spelling Gaia has become common due to the Gaia hypothesis , in which case its pronunciation is / ˈ ɡ aɪ . ə / rather than the more classical English / ˈ ɡ eɪ . ə / . There are a number of adjectives for the planet Earth. The word "earthly" is derived from "Earth". From the Latin Terra comes terran / ˈ t ɛr ə n / , terrestrial / t ə ˈ r ɛ s t r i ə l / , and (via French) terrene / t ə ˈ r iː n / , and from
5513-487: Is that it was formed by accretion from material loosed from Earth after a Mars -sized object with about 10% of Earth's mass, named Theia , collided with Earth. It hit Earth with a glancing blow and some of its mass merged with Earth. Between approximately 4.1 and 3.8 Ga , numerous asteroid impacts during the Late Heavy Bombardment caused significant changes to the greater surface environment of
5662-453: Is the basis for the astronomical unit (AU) and is equal to roughly 8.3 light minutes or 380 times Earth's distance to the Moon . Earth orbits the Sun every 365.2564 mean solar days , or one sidereal year . With an apparent movement of the Sun in Earth's sky at a rate of about 1°/day eastward, which is one apparent Sun or Moon diameter every 12 hours. Due to this motion, on average it takes 24 hours—a solar day—for Earth to complete
5811-457: Is tied to that of the Sun. Over the next 1.1 billion years , solar luminosity will increase by 10%, and over the next 3.5 billion years by 40%. Earth's increasing surface temperature will accelerate the inorganic carbon cycle , possibly reducing CO 2 concentration to levels lethally low for current plants ( 10 ppm for C4 photosynthesis ) in approximately 100–900 million years . A lack of vegetation would result in
5960-405: Is tilted with respect to the perpendicular to its orbital plane around the Sun, producing seasons . Earth is orbited by one permanent natural satellite , the Moon , which orbits Earth at 384,400 km (1.28 light seconds) and is roughly a quarter as wide as Earth. The Moon's gravity helps stabilize Earth's axis, causes tides and gradually slows Earth's rotation . Tidal locking has made
6109-531: The British Library and the Library of Congress treat "Doyle" alone as his surname. Steven Doyle, publisher of The Baker Street Journal , wrote: "Conan was Arthur's middle name. Shortly after he graduated from high school he began using Conan as a sort of surname. But technically his last name is simply 'Doyle'." When knighted, he was gazetted as Doyle, not under the compound Conan Doyle. Doyle
Earth in science fiction - Misplaced Pages Continue
6258-583: The Milky Way and orbits about 28,000 light-years from its center. It is about 20 light-years above the galactic plane in the Orion Arm . The axial tilt of Earth is approximately 23.439281° with the axis of its orbit plane, always pointing towards the Celestial Poles . Due to Earth's axial tilt, the amount of sunlight reaching any given point on the surface varies over the course of
6407-643: The Napoleonic Wars and features a character Gregory Brewster, written for Henry Irving ; The House of Temperley , the plot of which reflects his abiding interest in boxing; The Speckled Band , adapted from his earlier short story " The Adventure of the Speckled Band "; and an 1893 collaboration with J. M. Barrie on the libretto of Jane Annie . While living in Southsea , the seaside resort near Portsmouth , Doyle played football as
6556-759: The Pacific , North American , Eurasian , African , Antarctic , Indo-Australian , and South American . Other notable plates include the Arabian Plate , the Caribbean Plate , the Nazca Plate off the west coast of South America and the Scotia Plate in the southern Atlantic Ocean. The Australian Plate fused with the Indian Plate between 50 and 55 Ma . The fastest-moving plates are
6705-564: The Spiritualists' National Union to accept an eighth precept – that of following the teachings and example of Jesus of Nazareth . He was a member of the renowned supernaturalist organisation The Ghost Club . In 1919, the magician P. T. Selbit staged a séance at his flat in Bloomsbury , which Doyle attended. Although some later claimed that Doyle had endorsed the apparent instances of clairvoyance at that séance as genuine,
6854-716: The University of Edinburgh Medical School ; during this period he spent time working in Aston (then a town in Warwickshire , now part of Birmingham ), Sheffield and Ruyton-XI-Towns , Shropshire. Also during this period, he studied practical botany at the Royal Botanic Garden in Edinburgh. While studying, Doyle began writing short stories. His earliest extant fiction, "The Haunted Grange of Goresthorpe",
7003-475: The apocalyptic and post-apocalyptic fiction and the Dying Earth genres , Earth has been destroyed or at least ruined for generations to come; many such works are therefore set in the background of Earth changed into a wasteland. Some of the works in these genres overlap with the climate change genre, as climate change and resulting ecological disasters are a commonly used plot device for events that trigger
7152-419: The asthenosphere , the solid but less-viscous part of the upper mantle that can flow and move along with the plates. As the tectonic plates migrate, oceanic crust is subducted under the leading edges of the plates at convergent boundaries. At the same time, the upwelling of mantle material at divergent boundaries creates mid-ocean ridges. The combination of these processes recycles the oceanic crust back into
7301-415: The celestial equator , this is equivalent to an apparent diameter of the Sun or the Moon every two minutes; from Earth's surface, the apparent sizes of the Sun and the Moon are approximately the same. Earth orbits the Sun, making Earth the third-closest planet to the Sun and part of the inner Solar System . Earth's average orbital distance is about 150 million km (93 million mi), which
7450-442: The far future , Earth is just one of many inhabited planets of a galactic empire , federation or larger civilization, and many similar planets have been found or created (common themes in space opera ), all of which challenges the idea of Earth's uniqueness. In some works, Earth is still a center of the known universe, or at least a significant player on the galactic scene. In others, Earth has become of so little importance that it
7599-464: The future of Earth have been imagined. Some works focus on the end of the planet; those have been written in all forms – some focused on "ostentatious mourning"; others more of a slapstick comedy; yet others take this opportunity to explore themes of astronomy or sociology. The genre of climate fiction can often mix the themes of near and far future consequences of the climate change, whether anthropogenic or accidental . In other works, often found in
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#17327834032417748-408: The ocean floor form the top of Earth's crust , which together with parts of the upper mantle form Earth's lithosphere . Earth's crust may be divided into oceanic and continental crust. Beneath the ocean-floor sediments, the oceanic crust is predominantly basaltic , while the continental crust may include lower density materials such as granite , sediments and metamorphic rocks. Nearly 75% of
7897-430: The precessing or moving mean March equinox (when the Sun is at 90° on the equator), is 86,164.0905 seconds of mean solar time (UT1) (23 56 4.0905 ) . Thus the sidereal day is shorter than the stellar day by about 8.4 ms. Apart from meteors within the atmosphere and low-orbiting satellites, the main apparent motion of celestial bodies in Earth's sky is to the west at a rate of 15°/h = 15'/min. For bodies near
8046-413: The sphere of gravitational influence , of Earth is about 1.5 million km (930,000 mi) in radius. This is the maximum distance at which Earth's gravitational influence is stronger than that of the more distant Sun and planets. Objects must orbit Earth within this radius, or they can become unbound by the gravitational perturbation of the Sun. Earth, along with the Solar System, is situated in
8195-464: The "last ice age", covered large parts of the continents, to the middle latitudes, in ice and ended about 11,700 years ago. Chemical reactions led to the first self-replicating molecules about four billion years ago. A half billion years later, the last common ancestor of all current life arose. The evolution of photosynthesis allowed the Sun's energy to be harvested directly by life forms. The resultant molecular oxygen ( O 2 ) accumulated in
8344-523: The "lost cradle" or Earth. Finally, some stories told from the perspective of aliens focus on their discovery of Earth. Some works look backwards – or perhaps sideways, not to the future of Earth, but to its past ; here, works of science fiction can overlap with historic fiction as well as prehistoric fiction . This can happen particularly through the genres of alternate history as well as time travel (where as Gary Westfahl observed, most time travellers travel through time much more than space, visiting
8493-484: The Cambrian explosion, 535 Ma , there have been at least five major mass extinctions and many minor ones. Apart from the proposed current Holocene extinction event, the most recent was 66 Ma , when an asteroid impact triggered the extinction of non-avian dinosaurs and other large reptiles, but largely spared small animals such as insects, mammals , lizards and birds. Mammalian life has diversified over
8642-429: The Earth's axial tilt , or moving the Earth from its orbit. Some works deal with geoengineering , a term usually referred to large-scale projects attempting to deal with the problem of climate change ; a theme common in many works of climate fiction . In the extreme case, Earth can be consumed in its entirety, all of its mass repurposed in construction of megastructures such as a Dyson sphere . Various versions of
8791-654: The Earth. Terra is also the name of the planet in some Romance languages , languages that evolved from Latin , like Italian and Portuguese , while in other Romance languages the word gave rise to names with slightly altered spellings, like the Spanish Tierra and the French Terre . The Latinate form Gæa or Gaea ( English: / ˈ dʒ iː . ə / ) of the Greek poetic name Gaia ( Γαῖα ; Ancient Greek : [ɡâi̯.a] or [ɡâj.ja] )
8940-610: The English Amateur billiards championship in 1913. While living in Switzerland, Doyle became interested in skiing, which was relatively unknown in Switzerland at the time. He wrote an article, "An Alpine Pass on 'Ski ' " for the December 1894 issue of The Strand Magazine , in which he described his experiences with skiing and the beautiful alpine scenery that could be seen in the process. The article popularised
9089-630: The Holmes oeuvre, The Lost World . His historical novels include The White Company and its prequel Sir Nigel , set in the Middle Ages . He was a prolific author of short stories, including two collections set in Napoleonic times and featuring the French character Brigadier Gerard . Doyle's works for the stage include Waterloo , which centres on the reminiscences of an English veteran of
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#17327834032419238-600: The Irish Easter Rising , Casement was found guilty of treason against the Crown, and was sentenced to death. Doyle tried, unsuccessfully, to save him, arguing that Casement had been driven mad, and therefore should not be held responsible for his actions. As the First World War loomed, and having been caught up in a growing public swell of Germanophobia , Doyle gave a public donation of 10 shillings to
9387-575: The Jesuit school Stella Matutina in Feldkirch , Austria. His family decided that he would spend a year there in order to perfect his German and broaden his academic horizons. He was raised Catholic but later rejected the faith and became an agnostic . One source attributed his drift away from religion to the time he spent in the less strict Austrian school. He also later became a spiritualist mystic . From 1876 to 1881, Doyle studied medicine at
9536-593: The Latin Tellus comes tellurian / t ɛ ˈ l ʊər i ə n / and telluric . The oldest material found in the Solar System is dated to 4.5682 +0.0002 −0.0004 Ga (billion years) ago. By 4.54 ± 0.04 Ga the primordial Earth had formed. The bodies in the Solar System formed and evolved with the Sun. In theory, a solar nebula partitions a volume out of a molecular cloud by gravitational collapse, which begins to spin and flatten into
9685-559: The London Times . He also wrote The Doings of Raffles Haw . After visiting Venice and Milan , he spent a few days in Paris observing Edmund Landolt, an expert on diseases of the eye. Within three months of his departure for Vienna, Doyle returned to London. He opened a small office and consulting room at 2 Upper Wimpole Street, or 2 Devonshire Place as it was then. (There is today a Westminster City Council commemorative plaque over
9834-758: The Moon always face Earth with the same side. Earth, like most other bodies in the Solar System, formed 4.5 billion years ago from gas and dust in the early Solar System . During the first billion years of Earth's history , the ocean formed and then life developed within it. Life spread globally and has been altering Earth's atmosphere and surface, leading to the Great Oxidation Event two billion years ago. Humans emerged 300,000 years ago in Africa and have spread across every continent on Earth. Humans depend on Earth's biosphere and natural resources for their survival, but have increasingly impacted
9983-426: The Moon and, by inference, to that of Earth. Earth's atmosphere and oceans were formed by volcanic activity and outgassing . Water vapor from these sources condensed into the oceans, augmented by water and ice from asteroids, protoplanets , and comets . Sufficient water to fill the oceans may have been on Earth since it formed. In this model, atmospheric greenhouse gases kept the oceans from freezing when
10132-555: The Pole-Star" and " J. Habakuk Jephson's Statement ", both inspired by Doyle's time at sea. The latter popularised the mystery of the Mary Celeste and added fictional details such as that the ship was found in perfect condition (it had actually taken on water by the time it was discovered), and that its boats remained on board (the single boat was in fact missing). These fictional details have come to dominate popular accounts of
10281-636: The Portsmouth Eye Hospital in order to qualify to perform eye tests and prescribe glasses. Vienna had been suggested by his friend Vernon Morris as a place to spend six months and train to be an eye surgeon. But Doyle found it too difficult to understand the German medical terms being used in his classes in Vienna, and soon quit his studies there. For the rest of his two-month stay in Vienna, he pursued other activities, such as ice skating with his wife Louisa and drinking with Brinsley Richards of
10430-572: The Rifle Clubs Committee of the National Rifle Association . In 1901, Doyle was one of three judges for the world's first major bodybuilding competition, which was organised by the "Father of Bodybuilding", Eugen Sandow . The event was held in London's Royal Albert Hall . The other two judges were the sculptor Sir Charles Lawes-Wittewronge and Eugen Sandow himself. Doyle was an amateur boxer. In 1909, he
10579-458: The Solar System's planetary-sized objects, Earth is the object with the highest density . Earth's mass is approximately 5.97 × 10 kg ( 5.970 Yg ). It is composed mostly of iron (32.1% by mass ), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%), with the remaining 1.2% consisting of trace amounts of other elements. Due to gravitational separation ,
10728-403: The Sun when the star reaches its maximum radius, otherwise, with tidal effects, it may enter the Sun's atmosphere and be vaporized. Earth has a rounded shape , through hydrostatic equilibrium , with an average diameter of 12,742 kilometres (7,918 mi), making it the fifth largest planetary sized and largest terrestrial object of the Solar System . Due to Earth's rotation it has
10877-699: The accolade from the King in person at Buckingham Palace on 24 October of that year. He stood for Parliament twice as a Liberal Unionist : in 1900 in Edinburgh Central , and in 1906 in the Hawick Burghs , but was not elected. He served as a Deputy-Lieutenant of Surrey beginning in 1902, and was appointed a Knight of Grace of the Order of the Hospital of Saint John of Jerusalem in 1903. Doyle
11026-461: The activity and began the long association between Switzerland and skiing. In 1885 Doyle married Louisa (sometimes called "Touie") Hawkins (1857–1906). She was the youngest daughter of J. Hawkins, of Minsterworth , Gloucestershire, and the sister of one of Doyle's patients. Louisa had tuberculosis . In 1907, the year after Louisa's death, he married Jean Elizabeth Leckie (1874–1940). He had met and fallen in love with Jean in 1897, but had maintained
11175-444: The anti-immigration British Brothers' League . In 1914, Doyle was one of fifty-three leading British authors—including H. G. Wells , Rudyard Kipling and Thomas Hardy —who signed their names to the "Authors' Declaration", justifying Britain's involvement in the First World War. This manifesto declared that the German invasion of Belgium had been a brutal crime, and that Britain "could not without dishonour have refused to take part in
11324-425: The atmosphere and due to interaction with ultraviolet solar radiation, formed a protective ozone layer ( O 3 ) in the upper atmosphere. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes . True multicellular organisms formed as cells within colonies became increasingly specialized. Aided by the absorption of harmful ultraviolet radiation by
11473-524: The aunt of a friend, at Liberton Bank House on Gilmerton Road, while studying at Newington Academy. In 1867, the family came together again and lived in squalid tenement flats at 3 Sciennes Place . Doyle's father died in 1893, in the Crichton Royal , Dumfries , after many years of psychiatric illness. Beginning at an early age, throughout his life Doyle wrote letters to his mother. Many of them were preserved. Supported by wealthy uncles, Doyle
11622-615: The basic medical qualification in the UK) with a dissertation on tabes dorsalis in 1885. In 1882, Doyle partnered with his former classmate George Turnavine Budd in a medical practice in Plymouth , but their relationship proved difficult, and Doyle soon left to set up an independent practice. Arriving in Portsmouth in June 1882, with less than £10 (£1300 in 2023 ) to his name, he set up
11771-450: The center, the temperature may be up to 6,000 °C (10,830 °F), and the pressure could reach 360 GPa (52 million psi ). Because much of the heat is provided by radioactive decay, scientists postulate that early in Earth's history, before isotopes with short half-lives were depleted, Earth's heat production was much higher. At approximately 3 Gyr , twice the present-day heat would have been produced, increasing
11920-410: The classics. Doyle commented later in his life that this academic system could be excused only "on the plea that any exercise, however stupid in itself, forms a sort of mental dumbbell by which one can improve one's mind". He found the school harsh, noting that, instead of compassion and warmth, it favoured the threat of corporal punishment and ritual humiliation. From 1875 to 1876, he was educated at
12069-454: The continental crust , particularly during the early stages of Earth's history. New continental crust forms as a result of plate tectonics , a process ultimately driven by the continuous loss of heat from Earth's interior. Over the period of hundreds of millions of years, tectonic forces have caused areas of continental crust to group together to form supercontinents that have subsequently broken apart. At approximately 750 Ma , one of
12218-616: The continental surfaces are covered by sedimentary rocks, although they form about 5% of the mass of the crust. Earth's surface topography comprises both the topography of the ocean surface , and the shape of Earth's land surface. The submarine terrain of the ocean floor has an average bathymetric depth of 4 km, and is as varied as the terrain above sea level. Earth's surface is continually being shaped by internal plate tectonic processes including earthquakes and volcanism ; by weathering and erosion driven by ice, water, wind and temperature; and by biological processes including
12367-419: The core are chaotic; the magnetic poles drift and periodically change alignment. This causes secular variation of the main field and field reversals at irregular intervals averaging a few times every million years. The most recent reversal occurred approximately 700,000 years ago. The extent of Earth's magnetic field in space defines the magnetosphere . Ions and electrons of the solar wind are deflected by
12516-527: The core is primarily composed of the denser elements: iron (88.8%), with smaller amounts of nickel (5.8%), sulfur (4.5%), and less than 1% trace elements. The most common rock constituents of the crust are oxides . Over 99% of the crust is composed of various oxides of eleven elements, principally oxides containing silicon (the silicate minerals ), aluminium, iron, calcium, magnesium, potassium, or sodium. The major heat-producing isotopes within Earth are potassium-40 , uranium-238 , and thorium-232 . At
12665-463: The core, through the mantle, and up to Earth's surface, where it is, approximately, a dipole . The poles of the dipole are located close to Earth's geographic poles. At the equator of the magnetic field, the magnetic-field strength at the surface is 3.05 × 10 T , with a magnetic dipole moment of 7.79 × 10 Am at epoch 2000, decreasing nearly 6% per century (although it still remains stronger than its long time average). The convection movements in
12814-539: The days shorter. Above the Arctic Circle and below the Antarctic Circle there is no daylight at all for part of the year, causing a polar night , and this night extends for several months at the poles themselves. These same latitudes also experience a midnight sun , where the sun remains visible all day. By astronomical convention, the four seasons can be determined by the solstices—the points in
12963-611: The earliest known supercontinents, Rodinia , began to break apart. The continents later recombined to form Pannotia at 600–540 Ma , then finally Pangaea , which also began to break apart at 180 Ma . The most recent pattern of ice ages began about 40 Ma , and then intensified during the Pleistocene about 3 Ma . High- and middle-latitude regions have since undergone repeated cycles of glaciation and thaw, repeating about every 21,000, 41,000 and 100,000 years. The Last Glacial Period , colloquially called
13112-544: The equally large area of land under permafrost ) or deserts (33%). The pedosphere is the outermost layer of Earth's land surface and is composed of soil and subject to soil formation processes. Soil is crucial for land to be arable. Earth's total arable land is 10.7% of the land surface, with 1.3% being permanent cropland. Earth has an estimated 16.7 million km (6.4 million sq mi) of cropland and 33.5 million km (12.9 million sq mi) of pastureland. The land surface and
13261-413: The fall of human civilization (other plots involve the destruction of Earth from human warfare , alien invasions , or from various sorts of man-made incidents or accidental disasters). Many such works, set either during the disaster, or in its aftermath, are metaphors for environmental concerns or otherwise warnings about issues the writers think humanity needs to be concerned about. For many works set in
13410-478: The field of crime fiction. Doyle was a prolific writer. In addition to the Holmes stories, his works include fantasy and science fiction stories about Professor Challenger , and humorous stories about the Napoleonic soldier Brigadier Gerard , as well as plays, romances, poetry, non-fiction, and historical novels. One of Doyle's early short stories, " J. Habakuk Jephson's Statement " (1884), helped to popularise
13559-461: The front door.) He had no patients, according to his autobiography, and his efforts as an ophthalmologist were a failure. Doyle initially struggled to find a publisher. His first work featuring Sherlock Holmes and Dr. Watson, A Study in Scarlet , was written in three weeks when he was 27 and was accepted for publication by Ward Lock & Co on 20 November 1886, which gave Doyle £25 (equivalent to £3,500 in 2023) in exchange for all rights to
13708-638: The growth and decomposition of biomass into soil . Earth's mechanically rigid outer layer of Earth's crust and upper mantle , the lithosphere , is divided into tectonic plates . These plates are rigid segments that move relative to each other at one of three boundaries types: at convergent boundaries , two plates come together; at divergent boundaries , two plates are pulled apart; and at transform boundaries , two plates slide past one another laterally. Along these plate boundaries, earthquakes, volcanic activity , mountain-building , and oceanic trench formation can occur. The tectonic plates ride on top of
13857-404: The heat in Earth is lost through plate tectonics, by mantle upwelling associated with mid-ocean ridges . The final major mode of heat loss is through conduction through the lithosphere, the majority of which occurs under the oceans. The gravity of Earth is the acceleration that is imparted to objects due to the distribution of mass within Earth. Near Earth's surface, gravitational acceleration
14006-560: The incident, and Doyle's alternative spelling of the ship's name as the Marie Celeste has become more commonly used than the original spelling. Between 1888 and 1906, Doyle wrote seven historical novels, which he and many critics regarded as his best work. He also wrote nine other novels, and—later in his career (1912–29)—five narratives (three of novel or novella length) featuring the irascible scientist Professor Challenger . The Challenger stories include his best-known work after
14155-406: The land surface is taken by the four continental landmasses , which are (in descending order): Africa-Eurasia , America (landmass) , Antarctica , and Australia (landmass) . These landmasses are further broken down and grouped into the continents . The terrain of the land surface varies greatly and consists of mountains, deserts , plains , plateaus , and other landforms . The elevation of
14304-513: The land surface varies from a low point of −418 m (−1,371 ft) at the Dead Sea , to a maximum altitude of 8,848 m (29,029 ft) at the top of Mount Everest . The mean height of land above sea level is about 797 m (2,615 ft). Land can be covered by surface water , snow, ice, artificial structures or vegetation. Most of Earth's land hosts vegetation, but considerable amounts of land are ice sheets (10%, not including
14453-399: The lithosphere, which is divided into independently moving tectonic plates. Beneath the lithosphere is the asthenosphere , a relatively low-viscosity layer on which the lithosphere rides. Important changes in crystal structure within the mantle occur at 410 and 660 km (250 and 410 mi) below the surface, spanning a transition zone that separates the upper and lower mantle. Beneath
14602-410: The loss of oxygen in the atmosphere, making current animal life impossible. Due to the increased luminosity, Earth's mean temperature may reach 100 °C (212 °F) in 1.5 billion years, and all ocean water will evaporate and be lost to space, which may trigger a runaway greenhouse effect , within an estimated 1.6 to 3 billion years. Even if the Sun were stable, a fraction of the water in
14751-456: The lowercase when it is preceded by "the", such as "the atmosphere of the earth". It almost always appears in lowercase in colloquial expressions such as "what on earth are you doing?" The name Terra / ˈ t ɛr ə / occasionally is used in scientific writing and especially in science fiction to distinguish humanity's inhabited planet from others, while in poetry Tellus / ˈ t ɛ l ə s / has been used to denote personification of
14900-497: The magnetosphere. During magnetic storms and substorms , charged particles can be deflected from the outer magnetosphere and especially the magnetotail, directed along field lines into Earth's ionosphere , where atmospheric atoms can be excited and ionized, causing an aurora . Earth's rotation period relative to the Sun—its mean solar day—is 86,400 seconds of mean solar time ( 86,400.0025 SI seconds ). Because Earth's solar day
15049-409: The magnetosphere; solar wind pressure compresses the day-side of the magnetosphere, to about 10 Earth radii, and extends the night-side magnetosphere into a long tail. Because the velocity of the solar wind is greater than the speed at which waves propagate through the solar wind, a supersonic bow shock precedes the day-side magnetosphere within the solar wind. Charged particles are contained within
15198-483: The magnetosphere; the plasmasphere is defined by low-energy particles that essentially follow magnetic field lines as Earth rotates. The ring current is defined by medium-energy particles that drift relative to the geomagnetic field, but with paths that are still dominated by the magnetic field, and the Van Allen radiation belts are formed by high-energy particles whose motion is essentially random, but contained in
15347-417: The mantle, an extremely low viscosity liquid outer core lies above a solid inner core . Earth's inner core may be rotating at a slightly higher angular velocity than the remainder of the planet, advancing by 0.1–0.5° per year, although both somewhat higher and much lower rates have also been proposed. The radius of the inner core is about one-fifth of that of Earth. The density increases with depth. Among
15496-612: The mantle. Due to this recycling, most of the ocean floor is less than 100 Ma old. The oldest oceanic crust is located in the Western Pacific and is estimated to be 200 Ma old. By comparison, the oldest dated continental crust is 4,030 Ma , although zircons have been found preserved as clasts within Eoarchean sedimentary rocks that give ages up to 4,400 Ma , indicating that at least some continental crust existed at that time. The seven major plates are
15645-548: The modern oceans will descend to the mantle , due to reduced steam venting from mid-ocean ridges. The Sun will evolve to become a red giant in about 5 billion years . Models predict that the Sun will expand to roughly 1 AU (150 million km; 93 million mi), about 250 times its present radius. Earth's fate is less clear. As a red giant, the Sun will lose roughly 30% of its mass, so, without tidal effects, Earth will move to an orbit 1.7 AU (250 million km; 160 million mi) from
15794-399: The mother of Thor . Historically, "Earth" has been written in lowercase. Beginning with the use of Early Middle English , its definite sense as "the globe" was expressed as "the earth". By the era of Early Modern English , capitalization of nouns began to prevail , and the earth was also written the Earth , particularly when referenced along with other heavenly bodies. More recently,
15943-534: The mutilations continued after their suspect was jailed. Apart from helping George Edalji, Doyle's work helped establish a way to correct other miscarriages of justice, as it was partially as a result of this case that the Court of Criminal Appeal was established in 1907. The story of Doyle and Edalji was dramatised in an episode of the 1972 BBC television series, The Edwardians . In Nicholas Meyer's pastiche The West End Horror (1976), Holmes manages to help clear
16092-473: The mystery of the brigantine Mary Celeste , found drifting at sea with no crew member aboard. Doyle is often referred to as "Sir Arthur Conan Doyle" or "Conan Doyle", implying that "Conan" is part of a compound surname rather than a middle name. However, his baptism entry in the register of St Mary's Cathedral , Edinburgh, gives "Arthur Ignatius Conan" as his given names and "Doyle" as his surname. It also names Michael Conan as his godfather. The catalogues of
16241-424: The name is sometimes simply given as Earth , by analogy with the names of the other planets , though "earth" and forms with "the earth" remain common. House styles now vary: Oxford spelling recognizes the lowercase form as the more common, with the capitalized form an acceptable variant. Another convention capitalizes "Earth" when appearing as a name, such as a description of the "Earth's atmosphere", but employs
16390-669: The name of a shy Parsi Indian character wronged by the English justice system. Edalji was of Parsi heritage on his father's side. The story was fictionalised in Julian Barnes 's 2005 novel Arthur and George , which was adapted into a three-part drama by ITV in 2015. The second case, that of Oscar Slater —a Jew of German origin who operated a gambling den and was convicted of bludgeoning an 82-year-old woman in Glasgow in 1908—excited Doyle's curiosity because of inconsistencies in
16539-596: The naming, on 18 August, of Cape Flora, Bell Island , Nightingale Sound, Gratton ("Uncle Joe") Island, and Mabel Island. After graduating with Bachelor of Medicine and Master of Surgery (M.B. C.M.) degrees from the University of Edinburgh in 1881, he was ship's surgeon on the SS Mayumba during a voyage to the West African coast. He completed his Doctor of Medicine (M.D.) degree (an advanced degree beyond
16688-425: The newly forming Sun had only 70% of its current luminosity . By 3.5 Ga , Earth's magnetic field was established, which helped prevent the atmosphere from being stripped away by the solar wind . As the molten outer layer of Earth cooled it formed the first solid crust , which is thought to have been mafic in composition. The first continental crust , which was more felsic in composition, formed by
16837-649: The novel The Hound of the Baskervilles . Holmes's fictional connection with the Reichenbach Falls is celebrated in the nearby town of Meiringen . In 1903, Doyle published his first Holmes short story in ten years, " The Adventure of the Empty House ", in which it was explained that only Moriarty had fallen, but since Holmes had other dangerous enemies—especially Colonel Sebastian Moran —he had arranged to make it look as if he too were dead. Holmes
16986-593: The ocean may have covered Earth completely. The world ocean is commonly divided into the Pacific Ocean, Atlantic Ocean, Indian Ocean, Antarctic or Southern Ocean , and Arctic Ocean, from largest to smallest. The ocean covers Earth's oceanic crust , with the shelf seas covering the shelves of the continental crust to a lesser extent. The oceanic crust forms large oceanic basins with features like abyssal plains , seamounts , submarine volcanoes , oceanic trenches , submarine canyons , oceanic plateaus , and
17135-670: The oceanic plates, with the Cocos Plate advancing at a rate of 75 mm/a (3.0 in/year) and the Pacific Plate moving 52–69 mm/a (2.0–2.7 in/year). At the other extreme, the slowest-moving plate is the South American Plate, progressing at a typical rate of 10.6 mm/a (0.42 in/year). Earth's interior, like that of the other terrestrial planets, is divided into layers by their chemical or physical ( rheological ) properties. The outer layer
17284-599: The orbit of maximum axial tilt toward or away from the Sun—and the equinoxes , when Earth's rotational axis is aligned with its orbital axis. In the Northern Hemisphere, winter solstice currently occurs around 21 December; summer solstice is near 21 June, spring equinox is around 20 March and autumnal equinox is about 22 or 23 September. In the Southern Hemisphere, the situation is reversed, with
17433-649: The ozone layer, life colonized Earth's surface. Among the earliest fossil evidence for life is microbial mat fossils found in 3.48 billion-year-old sandstone in Western Australia , biogenic graphite found in 3.7 billion-year-old metasedimentary rocks in Western Greenland , and remains of biotic material found in 4.1 billion-year-old rocks in Western Australia. The earliest direct evidence of life on Earth
17582-474: The partial melting of this mafic crust. The presence of grains of the mineral zircon of Hadean age in Eoarchean sedimentary rocks suggests that at least some felsic crust existed as early as 4.4 Ga , only 140 Ma after Earth's formation. There are two main models of how this initial small volume of continental crust evolved to reach its current abundance: (1) a relatively steady growth up to
17731-501: The past 66 Mys , and several million years ago, an African ape species gained the ability to stand upright. This facilitated tool use and encouraged communication that provided the nutrition and stimulation needed for a larger brain, which led to the evolution of humans . The development of agriculture , and then civilization , led to humans having an influence on Earth and the nature and quantity of other life forms that continues to this day. Earth's expected long-term future
17880-463: The past or future versions of Earth). Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life . This is enabled by Earth being an ocean world , the only one in the Solar System sustaining liquid surface water . Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust . The remaining 29.2% of Earth's crust
18029-478: The planet's environment . Humanity's current impact on Earth's climate and biosphere is unsustainable , threatening the livelihood of humans and many other forms of life, and causing widespread extinctions . The Modern English word Earth developed, via Middle English , from an Old English noun most often spelled eorðe . It has cognates in every Germanic language , and their ancestral root has been reconstructed as * erþō . In its earliest attestation,
18178-400: The planet. The water vapor acts as a greenhouse gas and, together with other greenhouse gases in the atmosphere, particularly carbon dioxide (CO 2 ), creates the conditions for both liquid surface water and water vapor to persist via the capturing of energy from the Sun's light . This process maintains the current average surface temperature of 14.76 °C (58.57 °F), at which water
18327-421: The polar Northern and Southern hemispheres; or by longitude into the continental Eastern and Western hemispheres. Most of Earth's surface is ocean water: 70.8% or 361 million km (139 million sq mi). This vast pool of salty water is often called the world ocean , and makes Earth with its dynamic hydrosphere a water world or ocean world . Indeed, in Earth's early history
18476-512: The poor showing of British troops in the Boer War had led him to believe that the general population needed training in marksmanship. He was a champion of "miniature" rifle clubs, whose members shot small-calibre firearms on local ranges. These ranges were much cheaper and more accessible to working-class participants than large "fullbore" ranges, such as Bisley Camp , which were necessarily remote from population centres. Doyle went on to sit on
18625-495: The present day, which is supported by the radiometric dating of continental crust globally and (2) an initial rapid growth in the volume of continental crust during the Archean , forming the bulk of the continental crust that now exists, which is supported by isotopic evidence from hafnium in zircons and neodymium in sedimentary rocks. The two models and the data that support them can be reconciled by large-scale recycling of
18774-485: The present war". Doyle was also a fervent advocate of justice and personally investigated two closed cases, which led to two men being exonerated of the crimes of which they were accused. The first case, in 1906, involved a shy half-British, half-Indian lawyer named George Edalji , who had allegedly penned threatening letters and mutilated animals in Great Wyrley . Police were set on Edalji's conviction, even though
18923-496: The prosecution's case and a general sense that Slater was not guilty. He ended up paying most of the costs for Slater's successful 1928 appeal. Doyle had a longstanding interest in mystical subjects and remained fascinated by the idea of paranormal phenomena, even though the strength of his belief in their reality waxed and waned periodically over the years. In 1887, in Southsea, influenced by Major-General Alfred Wilks Drayson ,
19072-666: The publishing world, and so, after this, he left them. Short stories featuring Sherlock Holmes were published in the Strand Magazine . Doyle wrote the first five Holmes short stories from his office at 2 Devonshire Place. Doyle's attitude towards his most famous creation was ambivalent. In November 1891, he wrote to his mother: "I think of slaying Holmes, ... and winding him up for good and all. He takes my mind from better things." His mother responded, "You won't! You can't! You mustn't!" In an attempt to deflect publishers' demands for more Holmes stories, he raised his price to
19221-493: The rates of mantle convection and plate tectonics, and allowing the production of uncommon igneous rocks such as komatiites that are rarely formed today. The mean heat loss from Earth is 87 mW m , for a global heat loss of 4.42 × 10 W . A portion of the core's thermal energy is transported toward the crust by mantle plumes , a form of convection consisting of upwellings of higher-temperature rock. These plumes can produce hotspots and flood basalts . More of
19370-418: The science fiction authors, visible for example in J. G. Ballard 's 1962 essay Which Way to Inner Space? . Some critics of the "outer space adventures" have pointed to the importance of "earthly" concepts and imagery closer to contemporary readers' everyday experience. While it has been argued that a planet can be considered "too large, and its lifetime too long, to be comfortably accommodated within fiction as
19519-626: The second husband of Georgian Princess Nina Mdivani ; Adrian Malcolm (1910–1970); and Jean Lena Annette (1912–1997). None of Doyle's five children had children of their own, so he has no living direct descendants. Doyle served as a volunteer physician in the Langman Field Hospital at Bloemfontein between March and June 1900, during the Second Boer War in South Africa (1899–1902). Later that year, he wrote
19668-522: The shape of an ellipsoid , bulging at its Equator ; its diameter is 43 kilometres (27 mi) longer there than at its poles . Earth's shape also has local topographic variations; the largest local variations, like the Mariana Trench (10,925 metres or 35,843 feet below local sea level), shortens Earth's average radius by 0.17% and Mount Everest (8,848 metres or 29,029 feet above local sea level) lengthens it by 0.14%. Since Earth's surface
19817-636: The story. The piece appeared a year later in the Beeton's Christmas Annual and received good reviews in The Scotsman and the Glasgow Herald . Holmes was partially modelled on Doyle's former university teacher Joseph Bell . In 1892, in a letter to Bell, Doyle wrote, "It is most certainly to you that I owe Sherlock Holmes ... round the centre of deduction and inference and observation which I have heard you inculcate I have tried to build up
19966-461: The summer and winter solstices exchanged and the spring and autumnal equinox dates swapped. Arthur Conan Doyle Sir Arthur Ignatius Conan Doyle KStJ , DL (22 May 1859 – 7 July 1930) was a British writer and physician. He created the character Sherlock Holmes in 1887 for A Study in Scarlet , the first of four novels and fifty-six short stories about Holmes and Dr. Watson . The Sherlock Holmes stories are milestones in
20115-461: The word eorðe was used to translate the many senses of Latin terra and Greek γῆ gē : the ground, its soil , dry land, the human world, the surface of the world (including the sea), and the globe itself. As with Roman Terra /Tellūs and Greek Gaia , Earth may have been a personified goddess in Germanic paganism : late Norse mythology included Jörð ("Earth"), a giantess often given as
20264-620: The year. This causes the seasonal change in climate, with summer in the Northern Hemisphere occurring when the Tropic of Cancer is facing the Sun, and in the Southern Hemisphere when the Tropic of Capricorn faces the Sun. In each instance, winter occurs simultaneously in the opposite hemisphere. During the summer, the day lasts longer, and the Sun climbs higher in the sky. In winter, the climate becomes cooler and
20413-433: Was E. W. Hornung , creator of the literary character Raffles ), as well as his two nephews, also died shortly after the war. His second book on spiritualism, The Vital Message , appeared in 1919. Doyle found solace in supporting spiritualism's ideas and the attempts of spiritualists to find proof of an existence beyond the grave . In particular, according to some, he favoured Christian Spiritualism and encouraged
20562-540: Was 43. He was an occasional bowler who took one first-class wicket, W. G. Grace , and wrote a poem about the achievement. His captaincy of the Authors XI lasted from 1899 to 1912, during which time his cricket scores were by far the most common entries in his diary. In 1900, Doyle founded the Undershaw Rifle Club at his home, constructing a 100-yard range and providing shooting for local men, as
20711-588: Was a supporter of the campaign for the reform of the Congo Free State that was led by the journalist E. D. Morel and diplomat Roger Casement . In 1909 he wrote The Crime of the Congo , a long pamphlet in which he denounced the horrors of that colony. He became acquainted with Morel and Casement, and it is possible that, together with Bertram Fletcher Robinson , they inspired several characters that appear in his 1912 novel The Lost World . Later, after
20860-456: Was born on 22 May 1859 at 11 Picardy Place, Edinburgh , Scotland. His father, Charles Altamont Doyle , was born in England, of Irish Catholic descent, and his mother, Mary (née Foley), was Irish Catholic. His parents married in 1855. In 1864, the family scattered because of Charles's growing alcoholism. The children were temporarily housed across Edinburgh. Arthur lodged with Mary Burton ,
21009-659: Was initiated as a Freemason at the Phoenix Lodge No. 257 in Southsea. (He resigned from the Lodge in 1889, returned to it in 1902, and resigned again in 1911.) In 1889, he became a founding member of the Hampshire Society for Psychical Research; in 1893, he joined the London-based Society for Psychical Research ; and in 1894, he collaborated with Sir Sidney Scott and Frank Podmore in
21158-558: Was inspired by Hindu cosmology —and deliberately provocative works like S. Fowler Wright 's novel Beyond the Rim from 1932. There have also been fictional accounts of a hollow Earth , such as Edgar Allan Poe 's 1838 novel The Narrative of Arthur Gordon Pym of Nantucket inspired by John Cleves Symmes Jr. 's model featuring openings at the north and south poles whereby the interior can be accessed. A few writers have likewise engaged with another old fringe theory , that of Counter-Earth –
21307-968: Was invited to referee the James Jeffries – Jack Johnson heavyweight championship fight in Reno, Nevada . Doyle wrote: "I was much inclined to accept ... though my friends pictured me as winding up with a revolver at one ear and a razor at the other. However, the distance and my engagements presented a final bar." Also a keen golfer, Doyle was elected captain of the Crowborough Beacon Golf Club in Sussex for 1910. He had moved to Little Windlesham house in Crowborough with Jean Leckie, his second wife, and resided there with his family from 1907 until his death in July 1930. He entered
21456-642: Was prompted by the death of his son Kingsley, but Doyle began presenting himself publicly as a spiritualist in 1916, and Kingsley died on 28 October 1918 (from pneumonia contracted during his convalescence after being seriously wounded in the 1916 Battle of the Somme ). Nevertheless, the war-related deaths of many people who were close to him appear to have even further strengthened his long-held belief in life after death and spirit communication. Doyle's brother Brigadier-general Innes Doyle died, also from pneumonia, in February 1919. His two brothers-in-law (one of whom
21605-541: Was sent to England, to the Jesuit preparatory school Hodder Place , Stonyhurst in Lancashire, at the age of nine (1868–70). He went on to Stonyhurst College , which he attended until 1875. While Doyle was not unhappy at Stonyhurst, he said he did not have any fond memories of it because the school was run on medieval principles: the only subjects covered were rudiments, rhetoric , Euclidean geometry , algebra , and
21754-574: Was strengthened by what he took to be the psychic abilities of his children's nanny, Lily Loder Symonds. This and the constant drumbeat of wartime deaths inspired him with the idea that spiritualism was what he called a "New Revelation" sent by God to bring solace to the bereaved. He wrote a piece in Light magazine about his faith and began lecturing frequently on spiritualism. In 1918, he published his first spiritualist work, The New Revelation . Some have mistakenly assumed that Doyle's turn to spiritualism
21903-627: Was the Roman Terra or Tellus ). Bridging these ideas, and treating Earth as a semi-biological or even sentient entity, are classic works like Arthur Conan Doyle 's When the World Screamed (1928) and Jack Williamson's Born of the Sun (1934). Depictions of the Earth as being flat are uncommon in modern works, the sphericity of the planet having been proved around 200 B.C. by Archimedes and Eratosthenes . Exceptions to this include Terry Pratchett 's satirical Discworld series—which
22052-416: Was ultimately featured in a total of 56 short stories —the last published in 1927—and four novels by Doyle, and has since appeared in many novels and stories by other authors . Doyle's first novels were The Mystery of Cloomber , not published until 1888, and the unfinished Narrative of John Smith , published only posthumously, in 2011. He amassed a portfolio of short stories, including "The Captain of
22201-553: Was unsuccessfully submitted to Blackwood's Magazine . His first published piece, " The Mystery of Sasassa Valley ", a story set in South Africa, was printed in Chambers's Edinburgh Journal on 6 September 1879. On 20 September 1879, he published his first academic article, " Gelsemium as a Poison" in the British Medical Journal , a study which The Daily Telegraph regarded as potentially useful in
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