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A meteoroid is a small chunk of material typically from a comet, asteroid, or ejecta material from a planetary impact. When a meteoroid enters the Earth's atmosphere and becomes visible, it is known as a meteor (or shooting star).
The list of defined terms to the left is by no means exhaustive with
respect to the general subject of solar system dynamics.
The terms listed are thought to be those more commonly used on our site
and thus appropriate for inclusion on this page.