There are many more during several yearly meteor showers. Some display impressive fireballs, leaving cloudy trails behind. Any part of a meteor that reaches the ground is called a meteorite. As volatiles boil off from comets, they carry small solid particles with them. Particles released from comets in this way becomes a source for meteoroids, causing meteor showers as the Earth passes through them.
Meteoroids also come from the asteroid belt.
Some rare meteoroids are actually debris lofted from the Moon or Mars as the result of large impacts on those bodies.