comet

nouns

(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
comet
is derived from
cometary
is derived from
cometic
domain category
the branch of physics that studies celestial bodies and the universe as a whole
astronomy, uranology
is a type of (narrower)
a natural object existing outside the earth and outside the earth's atmosphere
estraterrestrial body, extraterrestrial object