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129-406: The narrative is notably unclear on God's reason for rejecting Cain's sacrifice. Some traditional interpretations consider Cain to be the originator of evil, violence, or greed. According to Genesis, Cain was the first human born and the first murderer. A question arising early in the story is why God rejected Cain's sacrifice. The text states, "In the course of time Cain brought some of the fruits of

258-497: A blindfolded man. The following family tree of the line of Cain is compiled from a variety of biblical and extra-biblical texts. Various early commentators have said that Cain and Abel have sisters, usually twin sisters. According to Rabbi Joshua ben Karha as quoted in Genesis Rabbah , "Only two entered the bed, and seven left it: Cain and his twin sister, Abel and his two twin sisters." The Book of Genesis does not give

387-414: A city-builder, and the forefather of tent-dwelling pastoralists, all lyre and pipe players, and bronze and iron smiths. In an alternate translation of Genesis 4:17, endorsed by a minority of modern commentators, Cain's son Enoch builds a city and names it after his son, Irad . Such a city could correspond with Eridu , one of the most ancient cities known. Philo observes that it makes no sense for Cain,

516-462: A concept that has been accepted for at least 1,800 years. This can be seen with Jubilees 4 which narrates that Cain settled down and married his sister Awan , who bore their first son, the first Enoch , approximately 196 years after the creation of Adam . Cain then establishes the first city, naming it after his son, builds a house, and lives there until it collapses on him, killing him on the same year of Adam's death. In this alternative reading of

645-564: A distance of one astronomical unit (AU) from the Sun (that is, at or near Earth's orbit). Sunlight on the surface of Earth is attenuated by Earth's atmosphere , so that less power arrives at the surface (closer to 1,000 W/m ) in clear conditions when the Sun is near the zenith . Sunlight at the top of Earth's atmosphere is composed (by total energy) of about 50% infrared light, 40% visible light, and 10% ultraviolet light. The atmosphere filters out over 70% of solar ultraviolet, especially at

774-497: A distinct literary genre. According to the Encyclopaedia Britannica , "Midrash was initially a philological method of interpreting the literal meaning of biblical texts. In time it developed into a sophisticated interpretive system that reconciled apparent biblical contradictions, established the scriptural basis of new laws, and enriched biblical content with new meaning. Midrashic creativity reached its peak in

903-478: A dream in which Cain drank his brother's blood. In an attempt to prevent the prophecy from happening the two young men are separated and given different jobs. The author Daniel Quinn , first in his book Ishmael and later in The Story of B , proposes that the story of Cain and Abel is an account of early Semitic herdsmen observing the beginnings of what he calls totalitarian agriculture, with Cain representing

1032-403: A fairly small amount of power being generated per cubic metre . Theoretical models of the Sun's interior indicate a maximum power density, or energy production, of approximately 276.5 watts per cubic metre at the center of the core, which, according to Karl Kruszelnicki , is about the same power density inside a compost pile . The fusion rate in the core is in a self-correcting equilibrium:

1161-414: A few millimeters. Re-emission happens in a random direction and usually at slightly lower energy. With this sequence of emissions and absorptions, it takes a long time for radiation to reach the Sun's surface. Estimates of the photon travel time range between 10,000 and 170,000 years. In contrast, it takes only 2.3 seconds for neutrinos , which account for about 2% of the total energy production of

1290-401: A granular appearance called the solar granulation at the smallest scale and supergranulation at larger scales. Turbulent convection in this outer part of the solar interior sustains "small-scale" dynamo action over the near-surface volume of the Sun. The Sun's thermal columns are Bénard cells and take the shape of roughly hexagonal prisms. The visible surface of the Sun, the photosphere,

1419-477: A handful of lines in the Biblical narrative may become a long philosophical discussion Jacob Neusner distinguishes three midrash processes: Numerous Jewish midrashim previously preserved in manuscript form have been published in print, including those denominated as smaller or minor midrashim. Bernard H. Mehlman and Seth M. Limmer deprecate this usage claiming that the term "minor" seems judgmental and "small"

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1548-626: A man from the Lord." In this viewpoint, articulated by Nachmanides in the thirteenth century, Cain's name presages his role of mastery, power, and sin. In one of the Legends of the Jews , Cain is the fruit of a union between Eve and Satan , who is also the angel Samael and the serpent in the Garden of Eden, and Eve exclaims at Cain's birth, "I have gotten a man through an angel of the Lord." According to

1677-401: A man kills his neighbour with the same shall he be killed; after the manner that he wounded him, in like manner shall they deal with him. A Talmudic tradition says that after Cain had murdered his brother, God made a horn grow on his head. Later, Cain was killed at the hands of his great-grandson, Lamech , who mistook him for a wild beast. A Christian version of this tradition from the time of

1806-560: A manner which helped to refute claims that they were only human interpretations—the argument being that, by presenting the various collections of different schools of thought, each of which relied upon close study of the text, the growing difference between early biblical law and its later rabbinic interpretation could be reconciled. Midrashim that seek to explain the non-legal portions of the Hebrew Bible are sometimes referred to as aggadah or Haggadah . Aggadic discussions of

1935-513: A means of rewriting it in a way that both makes it more acceptable to later ethical standards and conforms more to later notions of plausibility. James L. Kugel , in The Bible as It Was (Cambridge, Massachusetts: Harvard University Press, 1997), examines a number of early Jewish and Christian texts that comment on, expand, or re-interpret passages from the first five books of the Tanakh between

2064-520: A period known as the Maunder minimum . This coincided in time with the era of the Little Ice Age , when Europe experienced unusually cold temperatures. Earlier extended minima have been discovered through analysis of tree rings and appear to have coincided with lower-than-average global temperatures. The temperature of the photosphere is approximately 6,000 K, whereas the temperature of

2193-485: A phenomenon described by Hale's law . During the solar cycle's declining phase, energy shifts from the internal toroidal magnetic field to the external poloidal field, and sunspots diminish in number and size. At solar-cycle minimum, the toroidal field is, correspondingly, at minimum strength, sunspots are relatively rare, and the poloidal field is at its maximum strength. With the rise of the next 11-year sunspot cycle, differential rotation shifts magnetic energy back from

2322-473: A result, the outward-flowing solar wind stretches the interplanetary magnetic field outward, forcing it into a roughly radial structure. For a simple dipolar solar magnetic field, with opposite hemispherical polarities on either side of the solar magnetic equator, a thin current sheet is formed in the solar wind. At great distances, the rotation of the Sun twists the dipolar magnetic field and corresponding current sheet into an Archimedean spiral structure called

2451-574: A running commentary on specific passages in the Hebrew Scripture ( Tanakh ). The word Midrash , especially if capitalized, can refer to a specific compilation of these rabbinic writings composed between 400 and 1200 CE . According to Gary Porton and Jacob Neusner , midrash has three technical meanings: The Hebrew word midrash is derived from the root of the verb darash ( דָּרַשׁ ), which means "resort to, seek, seek with care, enquire, require", forms of which appear frequently in

2580-432: A sacrifice. Whoever God blessed would marry Aclima. When God openly rejected Cain's sacrifice, Cain slew his brother in a fit of jealousy and anger. Rabbinical exegetes have discussed whether Cain's incestuous relationship with his sister was in violation of halakha . A millennia-old explanation for Cain being capable of murder is that he may have been the offspring of a fallen angel or Satan himself, rather than being

2709-410: A slightly higher rate of fusion would cause the core to heat up more and expand slightly against the weight of the outer layers, reducing the density and hence the fusion rate and correcting the perturbation ; and a slightly lower rate would cause the core to cool and shrink slightly, increasing the density and increasing the fusion rate and again reverting it to its present rate. The radiative zone

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2838-432: A specific reason for the murder of Abel. Modern commentators typically assume that the motives were jealousy and anger due to God rejecting Cain's offering, while accepting Abel's. The First Epistle of John says the following: Do not be like Cain, who belonged to the evil one and murdered his brother. And why did he murder him? Because his own actions were evil and his brother's were righteous." Ancient exegetes , such as

2967-523: A text. This is not limited to the traditional thirteen textual tools attributed to the Tanna Rabbi Ishmael , which are used in the interpretation of halakha (Jewish law). The presence of words or letters which are seen to be apparently superfluous, and the chronology of events, parallel narratives or what are seen as other textual "anomalies" are often used as a springboard for interpretation of segments of Biblical text. In many cases,

3096-406: A transition layer, the tachocline . This is a region where the sharp regime change between the uniform rotation of the radiative zone and the differential rotation of the convection zone results in a large shear between the two—a condition where successive horizontal layers slide past one another. Presently, it is hypothesized that a magnetic dynamo, or solar dynamo , within this layer generates

3225-570: Is 1  astronomical unit ( 1.496 × 10  km ) or about 8 light-minutes away. Its diameter is about 1,391,400 km ( 864,600 mi ), 109 times that of Earth. Its mass is about 330,000 times that of Earth, making up about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen , carbon , neon , and iron . The Sun

3354-494: Is a G-type main-sequence star (G2V), informally called a yellow dwarf , though its light is actually white. It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud . Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System . The central mass became so hot and dense that it eventually initiated nuclear fusion in its core . Every second,

3483-479: Is a man's rivalry with his neighbour." (Kohelet IV, 4) . The term Midrash is also used of a rabbinic work that interprets Scripture in that manner. Such works contain early interpretations and commentaries on the Written Torah and Oral Torah (spoken law and sermons), as well as non-legalistic rabbinic literature ( aggadah ) and occasionally Jewish religious laws ( halakha ), which usually form

3612-456: Is based on pre-set assumptions about the sacred and divine nature of the text, and the belief in the legitimacy that accords with rabbinic interpretation. Although this material treats the biblical texts as the authoritative word of God, it is clear that not all of the Hebrew Bible was fixed in its wording at this time, as some verses that are cited differ from the Masoretic , and accord with

3741-495: Is based on the old Mormon belief that Cain is a black man who wanders the earth begging people to kill him and take his curse upon themselves (M, 24, SLC, 1963)." Freud's theory of fratricide is explained by the Oedipus or Electra complex through Carl Jung 's supplementation. There were other, minor traditions concerning Cain and Abel, of both older and newer date. The apocryphal Life of Adam and Eve tells of Eve having

3870-643: Is by far the brightest object in the Earth's sky , with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, Sirius , which has an apparent magnitude of −1.46. One astronomical unit (about 150 million kilometres; 93 million miles) is defined as the mean distance between the centres of the Sun and the Earth. The instantaneous distance varies by about ± 2.5 million km or 1.55 million miles as Earth moves from perihelion on ~ January 3rd to aphelion on ~ July 4th. At its average distance, light travels from

3999-510: Is considered to be the quintessential Son of Perdition , the father of secret combinations (i.e. secret societies and organized crime ), as well as the first to hold the title Master Mahan meaning master of [the] great secret, that [he] may murder and get gain . In Mormon folklore a second-hand account relates that an early Mormon leader, David W. Patten , encountered a very tall, hairy, dark-skinned man in Tennessee who said that he

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4128-436: Is defined to begin at the distance where the flow of the solar wind becomes superalfvénic —that is, where the flow becomes faster than the speed of Alfvén waves, at approximately 20 solar radii ( 0.1 AU ). Turbulence and dynamic forces in the heliosphere cannot affect the shape of the solar corona within, because the information can only travel at the speed of Alfvén waves. The solar wind travels outward continuously through

4257-402: Is facilitated by the full ionization of helium in the transition region, which significantly reduces radiative cooling of the plasma. The transition region does not occur at a well-defined altitude, but forms a kind of nimbus around chromospheric features such as spicules and filaments , and is in constant, chaotic motion. The transition region is not easily visible from Earth's surface, but

4386-501: Is inappropriate for midrashim some of which are lengthy. They propose instead the term "medieval midrashim", since the period of their production extended from the twilight of the rabbinic age to the dawn of the Age of Enlightenment . Generally speaking, rabbinic midrashim either focus on religious law and practice ( halakha ) or interpret biblical narrative in relation to non-legal ethics or theology, creating homilies and parables based on

4515-574: Is not available anywhere other than in the Torah. Targum Neophyti (Deuteronomy 30:12) and b. Baba Metzia 59b claim that this text means that Torah is no longer hidden away, but has been given to humans who are then responsible for following it. Sun The Sun is the star at the center of the Solar System . It is a massive, nearly perfect sphere of hot plasma , heated to incandescence by nuclear fusion reactions in its core, radiating

4644-409: Is only 84% of what it was in the protostellar phase (before nuclear fusion in the core started). In the future, helium will continue to accumulate in the core, and in about 5 billion years this gradual build-up will eventually cause the Sun to exit the main sequence and become a red giant . The chemical composition of the photosphere is normally considered representative of the composition of

4773-441: Is readily observable from space by instruments sensitive to extreme ultraviolet . The corona is the next layer of the Sun. The low corona, near the surface of the Sun, has a particle density around 10  m to 10  m . The average temperature of the corona and solar wind is about 1,000,000–2,000,000 K; however, in the hottest regions it is 8,000,000–20,000,000 K. Although no complete theory yet exists to account for

4902-410: Is strongly attenuated by Earth's ozone layer , so that the amount of UV varies greatly with latitude and has been partially responsible for many biological adaptations, including variations in human skin color . High-energy gamma ray photons initially released with fusion reactions in the core are almost immediately absorbed by the solar plasma of the radiative zone, usually after traveling only

5031-449: Is such that the midrash is a simple lesson to the uninitiated, and a direct allusion, or analogy, to a mystical teaching for those educated in this area. A wealth of literature and artwork has been created in the 20th and 21st centuries by people aspiring to create "contemporary midrash". Forms include poetry, prose, Bibliodrama (the acting out of Bible stories), murals, masks, and music, among others. The Institute for Contemporary Midrash

5160-422: Is suggested by a high abundance of heavy elements in the Solar System, such as gold and uranium , relative to the abundances of these elements in so-called Population II , heavy-element-poor, stars. The heavy elements could most plausibly have been produced by endothermic nuclear reactions during a supernova, or by transmutation through neutron absorption within a massive second-generation star. The Sun

5289-470: Is tens to hundreds of kilometers thick, and is slightly less opaque than air on Earth. Because the upper part of the photosphere is cooler than the lower part, an image of the Sun appears brighter in the center than on the edge or limb of the solar disk, in a phenomenon known as limb darkening . The spectrum of sunlight has approximately the spectrum of a black-body radiating at 5,772 K (9,930 °F), interspersed with atomic absorption lines from

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5418-437: Is the layer below which the Sun becomes opaque to visible light. Photons produced in this layer escape the Sun through the transparent solar atmosphere above it and become solar radiation, sunlight. The change in opacity is due to the decreasing amount of H ions , which absorb visible light easily. Conversely, the visible light perceived is produced as electrons react with hydrogen atoms to produce H ions. The photosphere

5547-424: Is the most prominent variation in which the number and size of sunspots waxes and wanes. The solar magnetic field extends well beyond the Sun itself. The electrically conducting solar wind plasma carries the Sun's magnetic field into space, forming what is called the interplanetary magnetic field . In an approximation known as ideal magnetohydrodynamics , plasma particles only move along magnetic field lines. As

5676-531: Is the only region of the Sun that produces an appreciable amount of thermal energy through fusion; 99% of the Sun's power is generated in the innermost 24% of its radius, and almost no fusion occurs beyond 30% of the radius. The rest of the Sun is heated by this energy as it is transferred outward through many successive layers, finally to the solar photosphere where it escapes into space through radiation (photons) or advection (massive particles). The proton–proton chain occurs around 9.2 × 10 times each second in

5805-420: Is the thickest layer of the Sun, at 0.45 solar radii. From the core out to about 0.7 solar radii , thermal radiation is the primary means of energy transfer. The temperature drops from approximately 7 million to 2 million kelvins with increasing distance from the core. This temperature gradient is less than the value of the adiabatic lapse rate and hence cannot drive convection, which explains why

5934-444: Is theorized to become a super dense black dwarf , giving off negligible energy. The English word sun developed from Old English sunne . Cognates appear in other Germanic languages , including West Frisian sinne , Dutch zon , Low German Sünn , Standard German Sonne , Bavarian Sunna , Old Norse sunna , and Gothic sunnō . All these words stem from Proto-Germanic * sunnōn . This

6063-538: Is ultimately related to the word for sun in other branches of the Indo-European language family, though in most cases a nominative stem with an l is found, rather than the genitive stem in n , as for example in Latin sōl , ancient Greek ἥλιος ( hēlios ), Welsh haul and Czech slunce , as well as (with *l > r ) Sanskrit स्वर् ( svár ) and Persian خور ( xvar ). Indeed,

6192-431: Is waiting to consume him: "If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door. It desires to have you, but you must rule over it. According to Genesis 4:1–16 , Cain treacherously murdered his brother, Abel, lied about the murder to God, and as a result, was cursed and marked for life. With the earth left cursed to drink Abel's blood, Cain could no longer farm

6321-402: Is wave heating, in which sound, gravitational or magnetohydrodynamic waves are produced by turbulence in the convection zone. These waves travel upward and dissipate in the corona, depositing their energy in the ambient matter in the form of heat. The other is magnetic heating, in which magnetic energy is continuously built up by photospheric motion and released through magnetic reconnection in

6450-646: The Apocryphon of John has Eve seduced by Yaldabaoth . However, in the Hypostasis of the Archons , Eve is raped by a pair of Archons . Pseudo-Philo , a Jewish work of the first century CE, relates that Cain murdered his brother at the age of 15. After escaping to the Land of Nod , Cain had four sons: Enoch , Olad, Lizpha, and Fosal, as well as two daughters, Citha and Maac. The latter five are not mentioned in

6579-515: The Life of Adam and Eve ( c.  1st century CE ), Cain fetched his mother a reed ( qaneh ) which is how he received his name Qayin (Cain). The symbolism of him fetching a reed may be a nod to his occupation as a farmer, as well as a commentary to his destructive nature. He is also described as "lustrous", which may reflect the Gnostic association of Cain with the sun . Cain is described as

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6708-547: The Alfvén surface , the boundary separating the corona from the solar wind, defined as where the coronal plasma's Alfvén speed and the large-scale solar wind speed are equal. During the flyby, Parker Solar Probe passed into and out of the corona several times. This proved the predictions that the Alfvén critical surface is not shaped like a smooth ball, but has spikes and valleys that wrinkle its surface. The Sun emits light across

6837-697: The Crusades holds that the slaying of Cain by Lamech took place on a mound called "Cain Mons" (i.e., Mount Cain), which is a corruption of "Caymont", a Crusader fort in Tel Yokneam in modern-day Israel . The story of Cain and Abel is also referred to in chapter 19 of 1 Meqabyan , a book considered canonical in the Ethiopian Orthodox Tewahedo Church . In this text, Cain killed Abel because he desired Abel's wife. According to

6966-751: The Mandaean scriptures, including the Qulasta , the Mandaean Book of John , the and Ginza Rabba , Abel is cognate with the angelic soteriological figure Hibil Ziwa who taught John the Baptist. In the book Aradia, or the Gospel of the Witches by Charles Godfrey Leland , Cain is a lunar figure . According to Rashi , who cites a midrash by Rabanus Maurus , Cain died from an arrow shot by

7095-559: The Midrash and the Conflict of Adam and Eve with Satan , tell that the motive involved a desire for the most beautiful woman. According to Midrashic tradition, Cain and Abel each had twin sisters; each was to marry the other's. The Midrash states that Abel's promised wife, Aclima , was more beautiful than Awan , Cain's promised wife. And so, after Cain would not consent to this arrangement, Adam suggested seeking God's blessing by means of

7224-524: The Parker spiral . Sunspots are visible as dark patches on the Sun's photosphere and correspond to concentrations of magnetic field where convective transport of heat is inhibited from the solar interior to the surface. As a result, sunspots are slightly cooler than the surrounding photosphere, so they appear dark. At a typical solar minimum , few sunspots are visible, and occasionally none can be seen at all. Those that do appear are at high solar latitudes. As

7353-410: The corona , and the heliosphere . The coolest layer of the Sun is a temperature minimum region extending to about 500 km above the photosphere, and has a temperature of about 4,100  K . This part of the Sun is cool enough to allow for the existence of simple molecules such as carbon monoxide and water. The chromosphere, transition region, and corona are much hotter than the surface of

7482-614: The l -stem survived in Proto-Germanic as well, as * sōwelan , which gave rise to Gothic sauil (alongside sunnō ) and Old Norse prosaic sól (alongside poetic sunna ), and through it the words for sun in the modern Scandinavian languages: Swedish and Danish sol , Icelandic sól , etc. The principal adjectives for the Sun in English are sunny for sunlight and, in technical contexts, solar ( / ˈ s oʊ l ər / ), from Latin sol . From

7611-428: The photosphere . For the purpose of measurement, the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun. By this measure, the Sun is a near-perfect sphere with an oblateness estimated at 9 millionths, which means that its polar diameter differs from its equatorial diameter by only 10 kilometers (6.2 mi). The tidal effect of

7740-511: The serpent ( nahash , Hebrew : נחש ) in the Garden of Eden , the devil himself. Christian exegesis of the "evil one" in 1 John 3:10–12 has also led some commentators, such as Tertullian , to agree that Cain was the son of the devil or a fallen angel . Thus, according to some interpreters, Cain was half-human and half-angel, one of the Nephilim (see Genesis 6 ). Gnostic exposition in

7869-444: The visible spectrum , so its color is white , with a CIE color-space index near (0.3, 0.3), when viewed from space or when the Sun is high in the sky. The Solar radiance per wavelength peaks in the green portion of the spectrum when viewed from space. When the Sun is very low in the sky, atmospheric scattering renders the Sun yellow, red, orange, or magenta, and in rare occasions even green or blue . Some cultures mentally picture

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7998-663: The Bible. The word midrash occurs twice in the Hebrew Bible: 2 Chronicles 13:22 "in the midrash of the prophet Iddo ", and 24:27 "in the midrash of the book of the kings". Both the King James Version (KJV) and English Standard Version (ESV) translate the word as "story" in both instances; the Septuagint translates it as βιβλίον (book) in the first, as γραφή (writing) in the second. The meaning of

8127-459: The Bible. Cain died at the age of 730, leaving his corrupt descendants to spread evil on Earth. According to the Book of Jubilees , Cain murdered his brother with a stone. Afterward, Cain was killed by the same instrument he used against his brother: his house fell in upon him, and its stones killed him. A heavenly law was cited after the narrative of Cain's death saying: With the instrument with which

8256-564: The God-fearing and that he wouldn't try to harm Cain. In the end, Cain kills Abel. God sends a crow searching in the ground to show Cain how to hide the disgrace of his brother. In his shame, Cain began to curse himself and became full of guilt. One popular theory regarding the name of Cain connects it to the verb "kana" ( קנה ‎ qnh ), meaning "to get" and used by Eve in Genesis 4:1 when she says after bearing Cain, "I have gotten

8385-465: The Greek helios comes the rare adjective heliac ( / ˈ h iː l i æ k / ). In English, the Greek and Latin words occur in poetry as personifications of the Sun, Helios ( / ˈ h iː l i ə s / ) and Sol ( / ˈ s ɒ l / ), while in science fiction Sol may be used to distinguish the Sun from other stars. The term sol with a lowercase s is used by planetary astronomers for

8514-457: The Hebrew word in these contexts is uncertain: it has been interpreted as referring to "a body of authoritative narratives, or interpretations thereof, concerning historically important figures" and seems to refer to a "book", perhaps even a "book of interpretation", which might make its use a foreshadowing of the technical sense that the rabbis later gave to the word. Since the early Middle Ages

8643-567: The Septuagint, or Samaritan Torah instead. With the growing canonization of the contents of the Hebrew Bible , both in terms of the books that it contained, and the version of the text in them, and an acceptance that new texts could not be added, there came a need to produce material that would clearly differentiate between that text, and rabbinic interpretation of it. By collecting and compiling these thoughts they could be presented in

8772-446: The Solar System . Long-term secular change in sunspot number is thought, by some scientists, to be correlated with long-term change in solar irradiance, which, in turn, might influence Earth's long-term climate. The solar cycle influences space weather conditions, including those surrounding Earth. For example, in the 17th century, the solar cycle appeared to have stopped entirely for several decades; few sunspots were observed during

8901-443: The Sun as yellow and some even red; the cultural reasons for this are debated. The Sun is classed as a G2 star, meaning it is a G-type star , with 2 indicating its surface temperature is in the second range of the G class. The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. The solar constant is equal to approximately 1,368 W/m (watts per square meter) at

9030-424: The Sun extends from the center to about 20–25% of the solar radius. It has a density of up to 150 g/cm (about 150 times the density of water) and a temperature of close to 15.7 million kelvin (K). By contrast, the Sun's surface temperature is about 5800 K . Recent analysis of SOHO mission data favors the idea that the core is rotating faster than the radiative zone outside it. Through most of

9159-438: The Sun into a red giant . This process will make the Sun large enough to render Earth uninhabitable approximately five billion years from the present. After the red giant phase, models suggest the Sun will shed its outer layers and become a dense type of cooling star (a white dwarf ), and no longer produce energy by fusion, but will still glow and give off heat from its previous fusion for perhaps trillions of years. After that, it

9288-413: The Sun's magnetic field . The Sun's convection zone extends from 0.7 solar radii (500,000 km) to near the surface. In this layer, the solar plasma is not dense or hot enough to transfer the heat energy of the interior outward via radiation. Instead, the density of the plasma is low enough to allow convective currents to develop and move the Sun's energy outward towards its surface. Material heated at

9417-398: The Sun's core by radiation rather than by convection (see Radiative zone below), so the fusion products are not lifted outward by heat; they remain in the core, and gradually an inner core of helium has begun to form that cannot be fused because presently the Sun's core is not hot or dense enough to fuse helium. In the current photosphere, the helium fraction is reduced, and the metallicity

9546-437: The Sun's core fuses about 600 billion kilograms (kg) of hydrogen into helium and converts 4 billion kg of matter into energy . About 4 to 7 billion years from now, when hydrogen fusion in the Sun's core diminishes to the point where the Sun is no longer in hydrostatic equilibrium , its core will undergo a marked increase in density and temperature which will cause its outer layers to expand, eventually transforming

9675-403: The Sun's horizon to Earth's horizon in about 8 minutes and 20 seconds, while light from the closest points of the Sun and Earth takes about two seconds less. The energy of this sunlight supports almost all life on Earth by photosynthesis , and drives Earth's climate and weather. The Sun does not have a definite boundary, but its density decreases exponentially with increasing height above

9804-499: The Sun's life, energy has been produced by nuclear fusion in the core region through the proton–proton chain ; this process converts hydrogen into helium. Currently, 0.8% of the energy generated in the Sun comes from another sequence of fusion reactions called the CNO cycle ; the proportion coming from the CNO cycle is expected to increase as the Sun becomes older and more luminous. The core

9933-551: The Sun's life, they account for 74.9% and 23.8%, respectively, of the mass of the Sun in the photosphere. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant. The Sun's original chemical composition was inherited from the interstellar medium out of which it formed. Originally it would have been about 71.1% hydrogen, 27.4% helium, and 1.5% heavier elements. The hydrogen and most of

10062-438: The Sun, to reach the surface. Because energy transport in the Sun is a process that involves photons in thermodynamic equilibrium with matter , the time scale of energy transport in the Sun is longer, on the order of 30,000,000 years. This is the time it would take the Sun to return to a stable state if the rate of energy generation in its core were suddenly changed. Electron neutrinos are released by fusion reactions in

10191-402: The Sun. The reason is not well understood, but evidence suggests that Alfvén waves may have enough energy to heat the corona. Above the temperature minimum layer is a layer about 2,000 km thick, dominated by a spectrum of emission and absorption lines. It is called the chromosphere from the Greek root chroma , meaning color, because the chromosphere is visible as a colored flash at

10320-428: The authoritative and revealed word of God by the midrashist and his audience, and in which this canonical text is explicitly cited or clearly alluded to". Lieve M. Teugels, who would limit midrash to rabbinic literature, offered a definition of midrash as "rabbinic interpretation of Scripture that bears the lemmatic form", a definition that, unlike Porton's, has not been adopted by others. While some scholars agree with

10449-486: The beginning and end of total solar eclipses. The temperature of the chromosphere increases gradually with altitude, ranging up to around 20,000 K near the top. In the upper part of the chromosphere helium becomes partially ionized . Above the chromosphere, in a thin (about 200 km ) transition region, the temperature rises rapidly from around 20,000 K in the upper chromosphere to coronal temperatures closer to 1,000,000 K . The temperature increase

10578-460: The core, but, unlike photons, they rarely interact with matter, so almost all are able to escape the Sun immediately. However, measurements of the number of these neutrinos produced in the Sun are lower than theories predict by a factor of 3. In 2001, the discovery of neutrino oscillation resolved the discrepancy: the Sun emits the number of electron neutrinos predicted by the theory, but neutrino detectors were missing 2 ⁄ 3 of them because

10707-501: The core, converting about 3.7 × 10 protons into alpha particles (helium nuclei) every second (out of a total of ~8.9 × 10 free protons in the Sun), or about 6.2 × 10  kg/s . However, each proton (on average) takes around 9 billion years to fuse with another using the PP chain. Fusing four free protons (hydrogen nuclei) into a single alpha particle (helium nucleus) releases around 0.7% of

10836-401: The corona reaches 1,000,000–2,000,000 K . The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy necessary to heat the corona is provided by turbulent motion in the convection zone below the photosphere, and two main mechanisms have been proposed to explain coronal heating. The first

10965-400: The duration of a solar day on another planet such as Mars . The astronomical symbol for the Sun is a circle with a center dot, [REDACTED] . It is used for such units as M ☉ ( Solar mass ), R ☉ ( Solar radius ) and L ☉ ( Solar luminosity ). The scientific study of the Sun is called heliology . The Sun is a G-type main-sequence star that makes up about 99.86% of

11094-491: The energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is by far the most important source of energy for life on Earth . The Sun has been an object of veneration in many cultures. It has been a central subject for astronomical research since antiquity . The Sun orbits the Galactic Center at a distance of 24,000 to 28,000 light-years . From Earth, it

11223-563: The external poloidal dipolar magnetic field is near its dynamo-cycle minimum strength; but an internal toroidal quadrupolar field, generated through differential rotation within the tachocline, is near its maximum strength. At this point in the dynamo cycle, buoyant upwelling within the convective zone forces emergence of the toroidal magnetic field through the photosphere, giving rise to pairs of sunspots, roughly aligned east–west and having footprints with opposite magnetic polarities. The magnetic polarity of sunspot pairs alternates every solar cycle,

11352-481: The first 'modern' agriculturists and Abel the pastoralists . Midrash Midrash ( / ˈ m ɪ d r ɑː ʃ / ; Hebrew : מִדְרָשׁ ; pl. מִדְרָשִׁים midrashim or מִדְרָשׁוֹת ‎ midrashot ) is expansive Jewish Biblical exegesis using a rabbinic mode of interpretation prominent in the Talmud . The word itself means "textual interpretation", "study", or " exegesis ", derived from

11481-461: The firstborn, pointing to an act of faith, since it is not guaranteed there will be more. The Midrash suggests that although Abel brought the best meat from his flock, Cain did not set aside the best of his harvest for God. Similar to the internalized spiritual death, God warns Adam and Eve off from eating the forbidden fruit—they do not physically die immediately, but over time, their bodies age and die—the Lord warns Cain that his inappropriate anger

11610-428: The function of much of midrashic interpretation has been distinguished from that of peshat , straight or direct interpretation aiming at the original literal meaning of a scriptural text. A definition of "midrash" repeatedly quoted by other scholars is that given by Gary G. Porton in 1981: "a type of literature, oral or written, which stands in direct relationship to a fixed, canonical text, considered to be

11739-404: The fused mass as energy, so the Sun releases energy at the mass–energy conversion rate of 4.26 billion kg/s (which requires 600 billion kg of hydrogen ), for 384.6  yottawatts ( 3.846 × 10  W ), or 9.192 × 10   megatons of TNT per second. The large power output of the Sun is mainly due to the huge size and density of its core (compared to Earth and objects on Earth), with only

11868-473: The ground raises the question, "Does the intimate connection between humans and the ground mean that the ground mirrors or aids human action, regardless of the nature of that action?" In Jewish tradition , Philo , Pirke De-Rabbi Eliezer , and the Targum Pseudo-Jonathan asserted that Adam was not the father of Cain. Instead, Eve was subject to adultery, having been seduced by Sammael ,

11997-482: The heliosphere, forming the solar magnetic field into a spiral shape, until it impacts the heliopause more than 50 AU from the Sun. In December 2004, the Voyager 1 probe passed through a shock front that is thought to be part of the heliopause. In late 2012, Voyager 1 recorded a marked increase in cosmic ray collisions and a sharp drop in lower energy particles from the solar wind, which suggested that

12126-432: The helium in the Sun would have been produced by Big Bang nucleosynthesis in the first 20 minutes of the universe, and the heavier elements were produced by previous generations of stars before the Sun was formed, and spread into the interstellar medium during the final stages of stellar life and by events such as supernovae . Since the Sun formed, the main fusion process has involved fusing hydrogen into helium. Over

12255-452: The importance of these texts for finding insights into the rabbinic culture that created them. Midrash is increasingly seen as a literary and cultural construction, responsive to literary means of analysis. Frank Kermode has written that midrash is an imaginative way of "updating, enhancing, augmenting, explaining, and justifying the sacred text". Because the Tanakh came to be seen as unintelligible or even offensive, midrash could be used as

12384-467: The land. He becomes a "fugitive and wanderer" and receives a mark from God - commonly referred to as the mark of Cain - so that no one can enact vengeance on him. Exegesis of the Septuagint 's narrative, "groaning and shaking upon the earth" has Cain suffering from body tremors. Interpretations extend Cain's curse to his descendants, where they all died in the Great Deluge as retribution for

12513-569: The limitation of the term "midrash" to rabbinic writings, others apply it also to certain Qumran writings, to parts of the New Testament , and of the Hebrew Bible (in particular the superscriptions of the Psalms, Deuteronomy, and Chronicles), and even modern compositions are called midrashim. Midrash is now viewed more as method than genre, although the rabbinic midrashim do constitute

12642-487: The loss of Abel's potential offspring. The Pearl of Great Price , a Mormon book of scripture, has been interpreted to depict the descendants of Cain as dark-skinned, and church president Brigham Young stated, "What is the mark? You will see it on the countenance of every African you ever did see...." In another biblical account, Ham discovered his father Noah drunk and naked in his tent. Because of this, Noah cursed Ham's son, Canaan to be "servants of servants". Although

12771-505: The mass of the Solar System. It has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way , most of which are red dwarfs . It is more massive than 95% of the stars within 7 pc (23 ly). The Sun is a Population I , or heavy-element-rich, star. Its formation approximately 4.6 billion years ago may have been triggered by shockwaves from one or more nearby supernovae . This

12900-444: The neutrinos had changed flavor by the time they were detected. The Sun has a stellar magnetic field that varies across its surface. Its polar field is 1–2 gauss (0.0001–0.0002  T ), whereas the field is typically 3,000 gauss (0.3 T) in features on the Sun called sunspots and 10–100 gauss (0.001–0.01 T) in solar prominences . The magnetic field varies in time and location. The quasi-periodic 11-year solar cycle

13029-563: The non-legal parts of Scripture are characterized by a much greater freedom of exposition than the halakhic midrashim (midrashim on Jewish law). Aggadic expositors availed themselves of various techniques, including sayings of prominent rabbis. These aggadic explanations could be philosophical or mystical disquisitions concerning angels , demons , paradise , hell , the messiah , Satan , feasts and fasts, parables , legends, satirical assaults on those who practice idolatry , etc. Some of these midrashim entail mystical teachings. The presentation

13158-419: The past 4.6 billion years, the amount of helium and its location within the Sun has gradually changed. The proportion of helium within the core has increased from about 24% to about 60% due to fusion, and some of the helium and heavy elements have settled from the photosphere toward the center of the Sun because of gravity . The proportions of heavier elements are unchanged. Heat is transferred outward from

13287-414: The photospheric surface. Both coronal mass ejections and high-speed streams of solar wind carry plasma and the interplanetary magnetic field outward into the Solar System. The effects of solar activity on Earth include auroras at moderate to high latitudes and the disruption of radio communications and electric power . Solar activity is thought to have played a large role in the formation and evolution of

13416-455: The planets is weak and does not significantly affect the shape of the Sun. The Sun rotates faster at its equator than at its poles . This differential rotation is caused by convective motion due to heat transport and the Coriolis force due to the Sun's rotation. In a frame of reference defined by the stars, the rotational period is approximately 25.6 days at the equator and 33.5 days at

13545-473: The poles. Viewed from Earth as it orbits the Sun, the apparent rotational period of the Sun at its equator is about 28 days. Viewed from a vantage point above its north pole, the Sun rotates counterclockwise around its axis of spin. A survey of solar analogs suggest the early Sun was rotating up to ten times faster than it does today. This would have made the surface much more active, with greater X-ray and UV emission. Sun spots would have covered 5–30% of

13674-557: The poloidal to the toroidal field, but with a polarity that is opposite to the previous cycle. The process carries on continuously, and in an idealized, simplified scenario, each 11-year sunspot cycle corresponds to a change, then, in the overall polarity of the Sun's large-scale magnetic field. The Sun's magnetic field leads to many effects that are collectively called solar activity . Solar flares and coronal mass ejections tend to occur at sunspot groups. Slowly changing high-speed streams of solar wind are emitted from coronal holes at

13803-448: The primordial Solar System. Typically, the solar heavy-element abundances described above are measured both by using spectroscopy of the Sun's photosphere and by measuring abundances in meteorites that have never been heated to melting temperatures. These meteorites are thought to retain the composition of the protostellar Sun and are thus not affected by the settling of heavy elements. The two methods generally agree well. The core of

13932-470: The probe had passed through the heliopause and entered the interstellar medium , and indeed did so on August 25, 2012, at approximately 122 astronomical units (18 Tm) from the Sun. The heliosphere has a heliotail which stretches out behind it due to the Sun's peculiar motion through the galaxy. On April 28, 2021, NASA's Parker Solar Probe encountered the specific magnetic and particle conditions at 18.8 solar radii that indicated that it penetrated

14061-405: The root verb darash ( דָּרַשׁ‎ ), which means "resort to, seek, seek with care, enquire, require". Midrash and rabbinic readings "discern value in texts, words, and letters, as potential revelatory spaces", writes the Hebrew scholar Wilda Gafney . "They reimagine dominant narratival readings while crafting new ones to stand alongside—not replace—former readings. Midrash also asks questions of

14190-436: The schools of Rabbi Ishmael and Akiba , where two different hermeneutic methods were applied. The first was primarily logically oriented, making inferences based upon similarity of content and analogy. The second rested largely upon textual scrutiny, assuming that words and letters that seem superfluous teach something not openly stated in the text." Many different exegetical methods are employed to derive deeper meaning from

14319-599: The scriptures do not mention Ham's skin color, some doctrines associated the curse with black people and used it to justify slavery . Cain's name in Islamic tradition is Qabil ( Arabic : قابيل ). His story is mentioned in the Quran , though without a name, where he and his brother Abel offer sacrifices; Abel's sacrifice was accepted while Cain's was not. Cain gets angry and threatens to murder his brother, but Abel tries to console him, saying that God only accepts sacrifices from

14448-437: The shorter wavelengths. Solar ultraviolet radiation ionizes Earth's dayside upper atmosphere, creating the electrically conducting ionosphere . Ultraviolet light from the Sun has antiseptic properties and can be used to sanitize tools and water. This radiation causes sunburn , and has other biological effects such as the production of vitamin D and sun tanning . It is the main cause of skin cancer . Ultraviolet light

14577-399: The soil as an offering to the Lord. And Abel also brought an offering—fat portions from some of the firstborn of his flock. The Lord looked with favor on Abel and his offering, but on Cain and his offering he did not look with favor." Noteworthy is the difference in the type of sacrifice: fruits of the soil are renewable and bloodless, while fat portions are set apart for the Lord and taken from

14706-425: The solar cycle progresses toward its maximum , sunspots tend to form closer to the solar equator, a phenomenon known as Spörer's law . The largest sunspots can be tens of thousands of kilometers across. An 11-year sunspot cycle is half of a 22-year Babcock –Leighton dynamo cycle, which corresponds to an oscillatory exchange of energy between toroidal and poloidal solar magnetic fields. At solar-cycle maximum,

14835-581: The son of Adam. A medieval legend has Cain arriving at the Moon , where he eternally settled with a bundle of twigs. This was originated by the popular fantasy of interpreting the shadows on the Moon as a face . An example of this belief can be found in Dante Alighieri 's Inferno (XX, 126) where the expression "Cain and the twigs" is used as a kenning for "moon". In Latter-day Saint theology , Cain

14964-417: The surface. The rotation rate was gradually slowed by magnetic braking , as the Sun's magnetic field interacted with the outflowing solar wind. A vestige of this rapid primordial rotation still survives at the Sun's core, which has been found to be rotating at a rate of once per week; four times the mean surface rotation rate. The Sun consists mainly of the elements hydrogen and helium . At this time in

15093-431: The tachocline picks up heat and expands, thereby reducing its density and allowing it to rise. As a result, an orderly motion of the mass develops into thermal cells that carry most of the heat outward to the Sun's photosphere above. Once the material diffusively and radiatively cools just beneath the photospheric surface, its density increases, and it sinks to the base of the convection zone, where it again picks up heat from

15222-424: The temperature of the corona, at least some of its heat is known to be from magnetic reconnection . The corona is the extended atmosphere of the Sun, which has a volume much larger than the volume enclosed by the Sun's photosphere. A flow of plasma outward from the Sun into interplanetary space is the solar wind . The heliosphere, the tenuous outermost atmosphere of the Sun, is filled with solar wind plasma and

15351-422: The tenuous layers above the photosphere. The photosphere has a particle density of ~10  m (about 0.37% of the particle number per volume of Earth's atmosphere at sea level). The photosphere is not fully ionized—the extent of ionization is about 3%, leaving almost all of the hydrogen in atomic form. The Sun's atmosphere is composed of five layers: the photosphere, the chromosphere , the transition region ,

15480-439: The text, the ground could be personified as a character. This reading is evidenced by given human qualities, like a mouth, in the scripture. The ground is also the only subject of an active verb in the verse that states, "It opens its mouth to take the blood." This suggests that the ground reacted to the situation. By that logic, the ground could then potentially be an accomplice to the murder of Abel (Jordstad 708). The reaction from

15609-516: The text. In the latter case they are described as aggadic . Midrash halakha is the name given to a group of tannaitic expositions on the first five books of the Hebrew Bible. These midrashim, written in Mishnaic Hebrew , clearly distinguish between the Biblical texts that they discuss, and the rabbinic interpretation of that text. They often go well beyond simple interpretation, and derive or provide support for halakha. This work

15738-440: The text; sometimes it provides answers, sometimes it leaves the reader to answer the questions". Vanessa Lovelace defines midrash as "a Jewish mode of interpretation that not only engages the words of the text, behind the text, and beyond the text, but also focuses on each letter, and the words left unsaid by each line". An example of a midrashic interpretation: "And God saw all that He had made, and found it very good. And there

15867-472: The third century BCE and the second century CE. Kugel traces how and why biblical interpreters produced new meanings by the use of exegesis on ambiguities, syntactical details, unusual or awkward vocabulary, repetitions, etc. in the text. As an example, Kugel examines the different ways in which the biblical story that God's instructions are not to be found in heaven (Deuteronomy 30:12) has been interpreted. Baruch 3:29-4:1 states that this means that divine wisdom

15996-430: The third human on Earth, to have founded an actual city. Instead, he argues, the city symbolizes an unrighteous philosophy. In the New Testament , Cain is cited as an example of unrighteousness in 1 John 3:12 and Jude 1:11 . The Targumim , rabbinic sources, and later speculations supplemented background details for the daughters of Adam and Eve . Such exegesis of Genesis 4 introduced Cain's wife as being his sister,

16125-404: The top of the radiative zone and the convective cycle continues. At the photosphere, the temperature has dropped 350-fold to 5,700 K (9,800 °F) and the density to only 0.2 g/m (about 1/10,000 the density of air at sea level, and 1 millionth that of the inner layer of the convective zone). The thermal columns of the convection zone form an imprint on the surface of the Sun giving it

16254-418: The transfer of energy through this zone is by radiation instead of thermal convection. Ions of hydrogen and helium emit photons, which travel only a brief distance before being reabsorbed by other ions. The density drops a hundredfold (from 20 000 kg/m to 200 kg/m ) between 0.25 solar radii and 0.7 radii, the top of the radiative zone. The radiative zone and the convective zone are separated by

16383-551: Was Cain. The account states that Cain had earnestly sought death but was denied it, and that his mission was to destroy the souls of men. The recollection of Patten's story is quoted in Spencer W. Kimball 's The Miracle of Forgiveness , a popular book within the Church of Jesus Christ of Latter-day Saints . This widespread Mormon belief is further emphasized by an account from Salt Lake City in 1963 which stated that "One superstition

16512-669: Was evening, and there was morning, the sixth day." ( Genesis 1:31)—Midrash: Rabbi Nahman said in Rabbi Samuel's name: "Behold, it was very good" refers to the Good Desire; "AND behold, it was very good" refers to the Evil Desire. Can then the Evil Desire be very good? That would be extraordinary! But without the Evil Desire, however, no man would build a house, take a wife and beget children; and thus said Solomon: "Again, I considered all labour and all excelling in work, that it

16641-407: Was formed to facilitate these reinterpretations of sacred texts. The institute hosted several week-long intensives between 1995 and 2004, and published eight issues of Living Text: The Journal of Contemporary Midrash from 1997 to 2000. According to Carol Bakhos, recent studies that use literary-critical tools to concentrate on the cultural and literary aspects of midrash have led to a rediscovery of

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