Gliese 581c: Perbedaan antara revisi
Konten dihapus Konten ditambahkan
Baris 10:
=== Orbit ===
Gliese 581 c memiliki periode orbit 13 hari Bumi dan mengorbit 14 kali lebih dekat kepada bintang utamanya daripada orbit Bumi mengelilingi Matahari,<ref>{{cite news |url=http://news.bbc.co.uk/1/hi/sci/tech/6589157.stm |title=New 'super-Earth' found in space |accessdate=2007-04-25 |date=25 April 2007 |publisher=BBC News }}</ref> sekitar 11 juta kilometer dari bintangnya, sementara Bumi berjarak 150 juta kilometer dari Matahari. .
===Iklim===
[[image:Gliese581cEarthComparison2.png|thumb|right|280px|Perbandingan antara [[Bumi]] dan Gliese 581 c]]
Gliese 581 c memiliki kesetimbangan temperatur permukaan diantara 0 °[[Celsius|C]] dan 40 °C.<ref name="BBC1">{{cite news |url=http://news.bbc.co.uk/1/hi/sci/tech/6589157.stm |title=New 'super-Earth' found in space |accessdate = 2007-04-25 |date=[[25 April]] [[2007]] |publisher=BBC News }}</ref> Namun, temperatur permukaan tergantung pada atmosfir planet, yang masih tidak diketahui. Anggota peneliti Xavier Delfosse menyangka bahwa temperatur permukaan hanya akan memanas;untuk contoh, the corresponding calculation for Earth yields an "effective surface temperature" of 256 K (−17 °C), yet Earth's true surface is 32 K warmer, an average of 288 K (15 °C), due to the [[greenhouse effect]] of its atmosphere.<ref>"More Earthlike Planets to Come", Wired Science, [http://blog.wired.com/wiredscience/2007/04/gliese_581c_dis.html]</ref>
Because of its close orbit around its parent star, the planet would experience [[tide]]s about 400 times as strong as those that the Moon causes on the Earth. <!-- Computation: star has 0.31 solar mass, Earth has 1/333,000 solar mass, Moon has 1/81 Earth mass, so star has 8.36 million moon masses. Moon's mean distance from Earth is 0.00257 AU, planet's mean distance from star is 0.07 AU or 27.2 times as much. 8,360,000/27.2^3 is 415. Round to one significant digit: 400. If someone can find a better computation of this number in a print source, they should
substitute it for this. -->
It may be [[Tidal locking|tidally locked]] to the star, with one [[hemisphere]] always lit and the other always dark.<ref>http://www.usatoday.com/printedition/news/20070425/1a_bottomstrip25_dom.art.htm</ref> The lit hemisphere might be extremely hot and the dark hemisphere extremely cold, while the narrow [[terminator (solar)|terminator]] or "twilight zone" between them might have a moderate [[climate]] more [[planetary habitability|suitable for life]] similar to Earth's.<ref>{{cite news |first=David |last=Perlman |title=New planet found: It might hold life |url=http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/04/24/BAG33PE14U26.DTL |work=[[San Francisco Chronicle]] |date=[[2007-04-24]] |accessdate = 2007-04-24 }}</ref>
A theoretical model predicts that volatile [[compound]]s such as [[water (molecule)|water]] and [[carbon dioxide]] might evaporate in the scorching heat of the sunward side, migrate to the cooler night side, and condense to form [[ice cap]]s. Over time, the entire atmosphere could become frozen as ice caps on the night side of the planet. Alternatively, if it has an atmosphere large enough to be stable, it should circulate the heat more evenly, allowing for a wider habitable area on the surface.<ref>{{cite web |url=http://www.sciam.com/article.cfm?chanID=sa004&articleID=000CC344-B043-1353-AF3383414B7FFE9F | title=Red Star Rising | last=Alpert | first=Mark | date=[[2005-11-07]] | publisher=Scientific American | accessdate = 2007-04-25}}</ref>
==Penemuan==
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