描述: 流星体是指小行星或彗星的碎片，大小范围从几毫米到数十米不等。无论该天体是否有大气层，流星体都可以以极高的速度向任何天体坠落。如果天体有大气层，流星体会因与大气分子碰撞而减速。我们在地球大气层中观测的流星体就是流星。如果流星体未在大气中完全烧毁（或者如果天体没有大气层），它会落到该天体的表面，此时称之为陨石。

相关词条

• 陨石
• 流星

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