Asteroids are celestial objects that resemble large chunks of rock and debris.

Here are some other terms you might be thinking of:

* Meteoroids: Smaller pieces of rock and debris orbiting the Sun.

* Comets: Icy bodies that release gas and dust as they approach the Sun.

* Planetesimals: Small bodies that formed during the early solar system and eventually coalesced into planets.

Let me know if you have any other questions!