Description: 流星（或流星）是小行星或彗星的碎片，或者是太空碎片，进入地球或其他天体的大气层后，由于与大气层摩擦产生热量而发亮。这种摩擦产生的热量类似于我们在寒冷时搓手取暖的方式。流星通常非常小，从几毫米到几厘米不等。天文学家称它们为流星。通过流星的方向、观测时间和颜色，我们可以进一步了解流星的起源和构成。

最亮的流星被称为 "火流星"，经常可以在天空中看到，有时甚至在白天。有时，观测者甚至会听到流星在大气层中燃烧和飞行时发出的声音。流星还会导致大气电离，对于地球来说，这可以通过雷达观测到。

在地球上，一年四季都能看到流星，但偶尔也会在短时间（例如，一晚上的时间）内出现许多流星。其中许多流星雨每年都会重复出现，并根据流星的起源（或辐射）星座来命名。著名的流星雨包括英仙座流星雨和狮子座流星雨。

Related Terms:

• 天体
• 陨石
• 流星体

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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