Answer:
The comet’s nucleus is the solid, core structure of a comet.
The coma or head is the fuzzy haze that surrounds the comet’s nucleus.
The tail may be made of gas, dust, or both. The coma and tail are what we see from Earth.
The sizes of comet nucleus have been observed up to around 30 kilometers or 20 miles in diameter.
When a comet gets close to the sun, they begin to heat up and outgas, making the coma and sometimes a tail.
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