What celestial phenomenon, named for its bright tail, marks the end of a comet's journey as it approaches the sun?

Category: Science · Difficulty: hard

Hint: It's the glowing envelope that surrounds the comet's nucleus.

Answer

Coma

Explanation

The coma is the nebulous envelope around the nucleus of a comet, formed by gas and dust when it nears the sun.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Coma.

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