1. Comets is made from rock, dust, and gases.
2. Comets is similar to a planet away from the sun.
3. But it’s not planet in solar system of the sun.
4. Difference point is that comets have a tail when close enough to the sun.
5. And comets have orbits that are either elliptical or parabolic.
6. Parabolic orbit are called to non-period comets and this comet appears only one time.
http://en.wikipedia.org/wiki/Comet
http://ja.wikipedia.org/wiki/%E5%BD%97%E6%98%9F
Hiroshi Yamaguchi
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