Meteoroids

A meteoroid is a small rocky or metallic body in outer space.

Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as moons or planets.

Meteoroids are freely floating objects, meteors are meteoroids falling through a planet's atmosphere, and meteorites are meteoroids that have landed on a bodies surface.