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陨石(meteorite)也称"陨星"，是地球以外脱离原有运行轨道的宇宙流星或尘碎块飞快散落到地球或其它行星表面的未燃尽的石质、铁质或是石铁混合的物质。Meteorite, also known as "meteorite", is an unburnt stone, iron, or stone-iron mixture of cosmic meteors or dust fragments that have departed from the original orbit outside the earth and quickly scattered to the surface of the earth or other planets.