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Comet - Wikipedia, the free encyclopedia (4380 words) |
 | Comets are believed to originate in a cloud (the Oort cloud) at large distances from the sun consisting of debris left over from the condensation of the solar nebula; the outer edges of such nebulae are cool enough that water exists in a solid (rather than gaseous) state. |
| Comets are now designated by the year of their discovery followed by a letter indicating the half-month of the discovery and a number indicating the order of discovery (a system similar to that already used for asteroids), so that the fourth comet discovered in the second half of February 2006 would be designated 2006 D4. |
| He rejected the ideas of several earlier philosophers that comets were planets, or at least a phenomenon related to the planets, on the grounds that while the planets confined their motion to the circle of the Zodiac, comets could appear in any part of the sky. |
| List of comets - Simple English Wikipedia (294 words) |
| This is a list of some comets in the solar system. |
| On this list there is a "P" in front of the periodic comets. |
| Periodic comets have a special place in astronomy, because their orbits are often the same. |
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