COMET

Meaning

A celestial body consisting mainly of ice, dust and gas in a (usually very eccentric) orbit around the Sun and having a "tail" of matter blown back from it by the solar wind as it approaches the Sun.

COMET as a word-puzzle answer

COMET is a 5-letter word with 2 vowels (O, E) and 3 consonants (C, M, T). Every letter is distinct, so it rarely punishes a clean opening guess.

It leans on high-frequency letters (O, E, T), so a strong vowel-and-common-consonant opener tends to light up quickly. There are no rare letters here, so it is a fair, mid-difficulty answer for the daily Classic puzzle.