Comet
Comets are large, icy bodies of frozen gases, dust, and rock, with a frozen nucleus. They orbit the Sun on highly elliptical paths. The distinctive tail is caused by the Sun tuning the ice into gas when they orbit close to the Sun.
Comets consist of four broad categories:
- Non-periodic comets: comets that have only passed through the Solar System once
- Short-period comets: comets with an orbit of fewer than 200 years
- Long-period comets: comets with an orbit of more than 200 years
- Lost comets: comets that have 'disappeared' and were not seen at their most recent perihelion (closest point to the Sun)
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