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Ages: 11-12
Astronomy - The Structure of a comet
Zielle S.
4/21/2015


B. The Structure of a comet (the parts of a comet)

The brightest part of a comet is the head, referred to as, the coma. This brightness of the coma increases in the middle. It is a great distance fro, one side of the coma to the other. Each comet is different, but some comets have a come as large as one million miles, or 1.6 million miles, from one side to the other. The center part of the coma is called the nucleus. When a comet is far away from the sun, scientists believe its nucleus is made of solid material.
The nucleus may be composed of:

1)Stone
2)Metal
3)Crystals of ice

Remember, a comet is a big dirty snowball. We can understand that a comet has ice crystals because things far away from the sun are extremely cold. It is thought that the ice is made of gases combined with dust and other particles.

Coming up: Astronomy - What is a meteor?
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