The spherical envelope of gas that surrounds a comet's nucleus is called a coma. When combined with the nucleus, it forms the comet's head. The coma is roughly a million kilometers across, and is comprised of dust and gases that have sublimed from the comet's nucleus.
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Answer:
coma
Explanation:
The spherical envelope of gas that surrounds a comet's nucleus is called a coma. When combined with the nucleus, it forms the comet's head. The coma is roughly a million kilometers across, and is comprised of dust and gases that have sublimed from the comet's nucleus.