(Astronomy) Any of the small solid bodies traveling through space around the sun.
Chunk of rock in interplanetary space. There is no official distinction between meteoroids and asteroids, except that the term asteroid is generally reserved for objects larger than 1.6 km/1 mi in diameter, whereas meteoroids can range anywhere from pebble-size up.
Meteoroids are believed to result from the fragmentation of asteroids after collisions. Some meteoroids strike the Earth's atmosphere, and their fiery trails are called meteors. If they fall to Earth, they are named meteorites.