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Britain.tv Wikipedia - Planet (Site not responding. Last check: 2007-11-06) |
 | | The number of planets dropped to the eight significantly larger bodies that had cleared their orbit (Mercury, Venus, Mars, Earth, Jupiter, Saturn, Uranus and Neptune), and a new class of dwarf planets was created, initially containing three objects (Ceres, Pluto and Eris). |
 | | Smaller terrestrial planets lose most of their atmospheres because of this accretion, but the lost gases can be replaced by outgassing from the mantle and from the subsequent impact of comets. |
 | | The existence of actual interstellar planets is considered likely based on computer simulations of the origin and evolution of planetary systems, which often include the ejection of bodies of significant mass. |
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