Most of this material is the size of sand grains, or smaller. Here is a diagram showing various kinds of objects in the solar system as subsets, or contributors to, other kinds. The labeled groups are not scaled by mass or number, although there are certainly far more minor objects than stars, planets and moons. The non-gaseous material that leaves comets enters the class of meteoroids. Meteorites have become part of a planet like Earth, or a moon.
Some astronomers even watch for meteorite impacts on our moon during meteor showers .
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