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Atmosphere

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helps to prevent this, as, normally, the solar wind would greatly enhance the escape of hydrogen. However, over the past 3 billion years Earth may have lost gases through the magnetic polar regions due to auroral activity, including a net 2% of its atmospheric oxygen. The net effect, taking the most
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contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases (by volume), but generally a variable amount of water vapor is also present, on average about 1% at sea level.
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Since a collection of gas molecules may be moving at a wide range of velocities, there will always be some fast enough to produce a slow leakage of gas into space. Lighter molecules move faster than heavier ones with the same thermal
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important escape processes into account, is that an intrinsic magnetic field does not protect a planet from atmospheric escape and that for some magnetizations the presence of a magnetic field works to increase the escape rate.
666:. The troposphere contains 75–80% of the mass of the atmosphere, and is the atmospheric layer wherein the weather occurs; the height of the troposphere varies between 17 km at the equator and 7.0 km at the poles. 1009:. On planets where the primary heat source is solar radiation, excess heat in the tropics is transported to higher latitudes. When a planet generates a significant amount of heat internally, such as is the case for 1292:"Titan: Interior, surface, atmosphere, and space environment, edited by I. Müller-Wodarg, C. A. Griffith, E. Lellouch, and T. E. Cravens. Cambridge, UK: Cambridge University Press, 2014, 474 p. $ 135, hardcover" 382:
Graphs of escape velocity against surface temperature of some Solar System objects showing which gases are retained. The objects are drawn to scale, and their data points are at the black dots in the middle.
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Composition and thickness is originally determined by the stellar nebula's chemistry and temperature, but can also by a product processes within the astronomical body outgasing a different atmosphere.
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that escape from objects with lower gravity. Secondly, the distance from the Sun determines the energy available to heat atmospheric gas to the point where some fraction of its molecules'
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and thus protects the organisms from genetic damage. The current composition of the atmosphere of the Earth is the product of billions of years of biochemical modification of the
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Atmospheres have dramatic effects on the surfaces of rocky bodies. Objects that have no atmosphere, or that have only an exosphere, have terrain that is covered in
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is a significant factor in shaping the terrain of rocky planets with atmospheres, and over time can erase the effects of both craters and
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The composition of Earth's atmosphere is determined by the by-products of the life that it sustains. Dry air (mixture of gases) from
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has an atmosphere of nitrogen and methane similar to Triton's, but these gases are frozen when it is farther from the Sun.
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Gunell, H.; Maggiolo, R.; Nilsson, H.; Stenberg Wieser, G.; Slapak, R.; Lindkvist, J.; Hamrin, M.; De Keyser, J. (2018).
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begins at 690 to 1,000 km from the surface, and extends to roughly 10,000 km, where it interacts with the
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before hitting a planet's surface. When meteoroids do impact, the effects are often erased by the action of wind.
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is composed of layers with different properties, such as specific gaseous composition, temperature, and pressure.
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Other bodies within the Solar System have extremely thin atmospheres not in equilibrium. These include the
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Atmospheres in boldface are significant atmospheres; atmospheres in italics are unconfirmed atmospheres.
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differs significantly among the planets. For example, the large gravitational force of the giant planet
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cannot exist without pressure, an atmosphere allows liquid to be present at the surface, resulting in
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is the lowest layer of the atmosphere. This extends from the planetary surface to the bottom of the
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of dry air, and the local acceleration of gravity at the point of barometric measurement.
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Atmospheres are clouds of gas bound to and engulfing an astronomical focal point of
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are known to have liquids at their surface and terrain on the planet suggests that
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This article is about atmospheres of celestial bodies. For Earth's atmosphere, see
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of the object. A planet retains an atmosphere when the gravity is great and the
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are lost more rapidly than those of high molecular weight. It is thought that
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are able to retain their atmospheres despite their relatively low gravities.
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of the vertical column of atmospheric gases. In said atmospheric model, the
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Properties of atmospheric strata – The flight environment of the atmosphere
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and other particles which, when they collide with the terrain, erode the
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The circulation of the atmosphere occurs due to thermal differences when
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Seki, K.; Elphic, R. C.; Hirahara, M.; Terasawa, T.; Mukai, T. (2001).
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Two satellites of the outer planets possess significant atmospheres.
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The first exoplanet whose atmospheric composition was determined is
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ranges from 50 km to 85 km and is the layer wherein most
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is the outer region of a star, which includes the layers above the
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Ingersoll, Andrew P. (1990). "Dynamics of Triton's atmosphere".
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Layer of gases surrounding an astronomical body held by gravity
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The low temperatures and higher gravity of the Solar System's
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extends from the top of the troposphere to the bottom of the
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measurement. The units of air pressure are based upon the
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extends from an altitude of 85 km to the base of the
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may have lost much of their water when, after being
460:. When in the part of its orbit closest to the Sun, 1145:Liddell, Henry George; Scott, Robert (2015-09-24). 67:. Unsourced material may be challenged and removed. 1005:becomes a more efficient transporter of heat than 516: 441:—allow them more readily to retain gases with low 1941: 1268:. San Francisco State University. Archived from 922:For planets with a significant atmosphere, most 456:, a moon of Neptune, have atmospheres mainly of 1403: 1233:"What is the Atmosphere Like on Other Planets?" 1165: 1585: 915:, and all of them collide with the surface as 326: 1641: 696:are incinerated before reaching the surface. 1544: 1334: 1224: 1144: 1194: 971: 1648: 1634: 1503: 1266:Department of Earth & Climate Sciences 1254: 633: 1535: 1464: 1340: 1307: 1283: 127:Learn how and when to remove this message 1621:Atmosphere – Everything you need to know 1588:An Introduction to Planetary Atmospheres 1432: 1230: 1138: 642: 377: 138: 1377: 968:had liquid on its surface in the past. 1942: 1384:Weaver, D.; Villard, R. (2007-01-31). 1289: 1629: 1388:. Hubble News Center. Archived from 1021:From the perspective of a planetary 65:adding citations to reliable sources 36: 1296:Meteoritics & Planetary Science 155:glow over the horizon is seen when 143:The atmospheric gases around Earth 13: 1579: 1212:from the original on 9 August 2022 863:into hydrogen and oxygen by solar 685:that Earth receives from the Sun. 359:with varyingly thick atmospheres, 196: 'vapour, steam' and 14: 1971: 1609: 1116:International Standard Atmosphere 867:radiation, the hydrogen escaped. 271:; lightning and bacteria perform 1683: 1586:Sanchez-Lavega, Agustin (2010). 1089: 875:Other mechanisms that can cause 778:equal to 2.71828) is called the 707:at 690 km and contains the 41: 1655: 1564:from the original on 2019-07-26 1421:from the original on 2022-06-10 1243:from the original on 2019-10-22 1183:from the original on 2022-04-19 517:Atmospheres in the Solar System 386:The atmospheres of the planets 373: 52:needs additional citations for 990: 344:can develop from interstellar 213: 'sphere') is a layer of 1: 1231:Williams, Matt (2016-01-07). 1202:"Evolution of the Atmosphere" 1131: 1016: 756:(atm), which is 101,325  167:is visible in the background. 811:retains light gases such as 736:Atmospheric pressure is the 394:are principally composed of 338:sufficiently dominating mass 229:of the atmosphere is low. A 7: 1917:Extraterrestrial atmosphere 1537:10.1051/0004-6361/201832934 1415:National Geographic Society 1082: 978:Extraterrestrial atmosphere 725: 327:Occurrence and compositions 25:Atmosphere (disambiguation) 10: 1976: 1516:Astronomy and Astrophysics 994: 975: 902: 797: 729: 647:Earth's atmosphere profile 331: 199: 182: 29: 18: 1930: 1899: 1865: 1798: 1759: 1692: 1681: 1663: 1290:Lorenz, Ralph D. (2014). 1262:"Atmospheric Composition" 793: 972:Outside the Solar System 760:(equivalent to 760  638: 452:, a moon of Saturn, and 1528:2018A&A...614L...3G 1475:10.1126/science.1058913 1155:Perseus Digital Library 1151:A Greek-English Lexicon 997:Atmospheric circulation 634:Structure of atmosphere 597:Atmosphere of Enceladus 299:use carbon dioxide for 221:, held in place by the 32:Atmospheric Environment 1206:globalchange.umich.edu 869:Earth's magnetic field 847:, and so gases of low 648: 580:Atmosphere of Ganymede 570:Atmosphere of Callisto 543:Atmosphere of the Moon 383: 168: 23:. For other uses, see 1161:on 24 September 2015. 940:. In addition, since 883:-induced sputtering, 683:ultraviolet radiation 646: 616:Atmosphere of Neptune 609:Atmosphere of Titania 560:Atmosphere of Jupiter 528:Atmosphere of Mercury 523:Atmosphere of the Sun 381: 323:by living organisms. 279:that is used to make 142: 1907:Prebiotic atmosphere 1592:Taylor & Francis 1111:Atmospheric pressure 1064:and its variations. 919:and create craters. 877:atmosphere depletion 823:exceed the planet's 746:atmospheric pressure 732:Atmospheric pressure 621:Atmosphere of Triton 604:Atmosphere of Uranus 587:Atmosphere of Saturn 575:Atmosphere of Europa 357:astronomical objects 350:protoplanetary disks 61:improve this article 1457:2001Sci...291.1939S 1451:(5510): 1939–1941. 1355:1990Natur.344..315I 754:standard atmosphere 677:, and contains the 653:atmosphere of Earth 628:Atmosphere of Pluto 592:Atmosphere of Titan 555:Atmosphere of Ceres 538:Atmosphere of Earth 533:Atmosphere of Venus 249:atmosphere of Earth 219:astronomical object 21:Atmosphere of Earth 1922:Stellar atmosphere 1800:Natural satellites 1309:10.1111/maps.12317 800:Atmospheric escape 649: 550:Atmosphere of Mars 415:Earth's atmosphere 384: 231:stellar atmosphere 169: 145:scatter blue light 1960:Planetary science 1937: 1936: 1349:(6264): 315–317. 1319:978-0-521-19992-6 1007:thermal radiation 776:irrational number 342:planetary nucleus 273:nitrogen fixation 137: 136: 129: 111: 1967: 1687: 1650: 1643: 1636: 1627: 1626: 1605: 1573: 1572: 1570: 1569: 1548: 1542: 1541: 1539: 1507: 1501: 1500: 1498: 1497: 1468: 1436: 1430: 1429: 1427: 1426: 1407: 1401: 1400: 1398: 1397: 1381: 1375: 1374: 1363:10.1038/344315a0 1338: 1332: 1331: 1311: 1302:(6): 1139–1140. 1287: 1281: 1280: 1278: 1277: 1258: 1252: 1251: 1249: 1248: 1228: 1222: 1221: 1219: 1217: 1198: 1192: 1191: 1189: 1188: 1169: 1163: 1162: 1157:. Archived from 1142: 1099: 1094: 1093: 861:photodissociated 849:molecular weight 565:Atmosphere of Io 443:molecular masses 346:molecular clouds 217:that envelop an 210: 203: 193: 186: 149:visible spectrum 132: 125: 121: 118: 112: 110: 69: 45: 37: 1975: 1974: 1970: 1969: 1968: 1966: 1965: 1964: 1940: 1939: 1938: 1933: 1926: 1895: 1861: 1794: 1755: 1688: 1679: 1659: 1654: 1612: 1602: 1582: 1580:Further reading 1577: 1576: 1567: 1565: 1550: 1549: 1545: 1508: 1504: 1495: 1493: 1466:10.1.1.471.2226 1437: 1433: 1424: 1422: 1409: 1408: 1404: 1395: 1393: 1382: 1378: 1339: 1335: 1320: 1288: 1284: 1275: 1273: 1260: 1259: 1255: 1246: 1244: 1229: 1225: 1215: 1213: 1200: 1199: 1195: 1186: 1184: 1171: 1170: 1166: 1143: 1139: 1134: 1095: 1088: 1085: 1019: 999: 993: 980: 974: 905: 825:escape velocity 805:Surface gravity 802: 796: 764:or 14.696  734: 728: 641: 636: 519: 376: 334: 329: 321:paleoatmosphere 275:which produces 251:is composed of 157:observing Earth 133: 122: 116: 113: 70: 68: 58: 46: 35: 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scatter blue light
visible spectrum
blue
observing Earth
outer space
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Ancient Greek
ἀτμός
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gasses
astronomical object
gravity
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stellar atmosphere
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