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A '''meteoroid''' is a small sand- to boulder-sized particle of astronomical debris in the [[Solar system]], smaller than an [[asteroid]]. <br>The visible path of a meteoroid that enters a planet's atmosphere is a meteor, commonly called a "shooting star" or "falling star". * Upon reaching the ground, a "meteor" is then called a "'''meteorite'''."

Meteoroid collisions with solid Solar System objects create impact craters, which are the dominant geographic features of many objects. <br> On planets and moons with active surface geological processes, visible impact craters may become eroded, buried, or transformed by tectonics over time.