an object that moves around the sun, usually at a great distance from it, that is seen on rare occasions from the earth as a bright line in the sky
Comets take many decades to complete an orbit around a star.
As the night sky darkened, a bright comet streaked across the heavens, captivating everyone who gazed up at its celestial display.
With the aid of a telescope, amateur astronomers eagerly awaited the rare sighting of a comet that was expected to pass close to Earth.
The ancient civilizations often viewed comets as omens, interpreting their appearance in the night sky as significant events foretelling change.
Scientists study comets to unlock the mysteries of the early solar system, as these icy bodies may contain clues about the origins of our planetary system.
