Coma
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Example:
Imagine trying to see through a fogged-up bathroom mirror after a hot shower. Just as the steam and condensation blur your reflection, making everything seem fuzzy and unclear, the coma of a comet creates a similar effect in space. The coma, made of ice and comet dust, surrounds the comet's nucleus like the condensed steam on the mirror, obscuring the solid core and giving it a blurred, fuzzy appearance.

Practice Version

Coma: The fuzzy head of a comet, made of ice and comet dust. Coma. The coma is the glowing cloud surrounding a comet's nucleus when it is close to the sun.