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...eous [[protoplanetary disk]] around the young star. This may give birth to planets in certain circumstances, which are not well known. Thus the formation of p ...,000 years. The accretion stops when the gas is exhausted. The formed planets can migrate over long distances during or after their formation. The [[ice ...

...small terrestrial planets remains a possibility, the existence of massive planets has been largely discounted, and Van de Kamp's specific claims overturned. ...were apparently refined in a 1969 paper. Later that year he suggested two planets of 1.1 and 0.8 Jupiter masses.<ref>{{cite journal | author = Van de Kamp, P ...

...ly 2008.<ref name=Brown>{{cite web|author=Michael E. Brown|title=The Dwarf Planets|publisher=California Institute of Technology, Department of Geological Scie ...ly close to the [[ecliptic]] (the region of the sky that the Sun, Moon and planets appear to lie in, as seen from Earth), due to the greater likelihood of fin ...

| title=Are beryllium abundances anomalous in stars with giant planets? ...and so it is thought to be less likely to host [[terrestrial planets|rocky planets]]. Observations have detected more than 10 times as much dust surrounding T ...

...{as of|2009|January|lc=on}}.<ref name=count>{{cite web |title=Trojan Minor Planets |url=http://www.cfa.harvard.edu/iau/lists/Trojans.html |publisher=Internati ...n or slightly later, during the [[planetary migration|migration]] of giant planets.<ref name=Jewitt2004/> ...

...e dawn of the [[space age]] in the 1950s and the discovery of [[extrasolar planets]] in the 1990s, the models have been both challenged and refined to account ...ution of the solar system. The positions of the planets often shifted, and planets have switched places.<ref name="Gomes"/> This [[planetary migration]] now i ...

...strial planets]], are primarily composed of rock and metal. The four outer planets, [[Jupiter]], [[Saturn]], [[Uranus]] and [[Neptune]], also called the [[gas ...ugh to have been rounded by their own gravity, and are thus termed [[dwarf planets]]. The hypothetical [[Oort cloud]], which acts as the source for [[long-per ...

...planetary orbits are close to face-on as observed from Earth, more massive planets could have evaded detection by the radial velocity method.</ref> The detect | url=http://solarsystem.nasa.gov/planets/profile.cfm?Object=Sun&Display=Facts&System=Metric ...

...oloured green, while scattered objects are coloured orange. The four outer planets are blue. Neptune's few known [[Trojan asteroid]]s are yellow, while Jupite ...s as massive.<ref name=beyond>{{cite web|title=The Solar System Beyond The Planets|author=Audrey Delsanti and David Jewitt|work=Institute for Astronomy, Unive ...

| url=http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune&Display=OverviewLong | title=Planets Beyond: Discovering the Outer Solar System ...

...}}</ref> Even if intelligent life occurs on only a minuscule percentage of planets around these stars, there should still be a great number of civilizations e ...izations. The fundamental problem is that the last four terms (fraction of planets with life, odds life becomes intelligent, odds intelligent life becomes com ...

*{{cite web|url=http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Oberon|publisher=[[NASA]]'s Solar System Exploration *{{cite web|url=http://www.nineplanets.org/oberon.html|publisher=The Nine Planets Solar System Tour|title=Oberon profile|accessdate=March 6, 2009|date=Decemb ...

| title=A Field Guide to Stars and Planets === Possible planets === ...

Compared with planets and other astronomical bodies, the objects of everyday life (people, cars, ...ton's law of gravity]] was accepted because it accounted for the motion of planets and moons in the solar system with exquisite accuracy. However, as the pre ...

| url = http://solarsystem.jpl.nasa.gov/planets/profile.cfm?Object=Mars&Display=Facts&System=Metric ...ist and were instead explained as [[optical illusion]]s. Still, of all the planets in the Solar System other than Earth, Mars is the most likely to harbor liq ...

...is not known to exist on any other planet's surface.<ref group=note>Other planets in the Solar System are either too hot or too cold to support liquid water. Earth and the other planets in the Solar System formed out of the [[solar nebula]]—a disk-shaped mass o ...

...stars into [[constellations]] and used them to track the motions of the [[planets]] and the inferred position of the Sun.<ref name="forbes">{{cite book ...the stars were actually other suns, and may have [[Extrasolar planet|other planets]], possibly even Earth-like, in orbit around them,<ref name="he history">{{ ...

...aces the Sun is fully lit, and the side which is away from it is dark. The planets (as well as the Moon) have the nature of water and reflect light. The light <blockquote>The Moon and the planets are Yin; they have shape but no light. This they receive only when the Sun ...

...authors=Estrada, Paul R|title=Formation of the regular satellites of giant planets in an extended gaseous nebula I: subnebula model and accretion of satellite *[http://solarsystem.nasa.gov/planets/profile.cfm?Object=Jup_Ganymede Ganymede Profile] by [http://solarsystem.na ...

...re one way astronomers have been able to [[Methods of detecting extrasolar planets#Radial velocity|diagnose and measure]] the presence and characteristics of ...