Glossary term: Meteoroid

Description: A meteoroid is a fragment of an asteroid or comet with a size ranging from a few millimeters to several tens of meters. These can fall towards any celestial object, with or without an atmosphere, at very high speed. If the celestial body has an atmosphere the meteroid is slowed by collisions with atmospheric molecules. We observe meteroids in Earth's atmoshpere meteors. If the meteoroid is not completely destroyed in the atmosphere (or if the celestial body has no atmosphere) it falls to the surface of that body, and then it is called a meteorite.

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The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".