| 单词 | meteor |
| 释义 | meteor A streak of light observable in the sky when a particle of matter enters the earth's atmosphere and becomes incandescent as a result of friction with atmospheric atoms and molecules. These particles of matter are known collectively as meteoroids . Meteoroids that survive their passage through the atmosphere and strike the earth's surface are known as meteorites . Only some 2500 meteorites are known, excluding the micrometeorites (bodies less than 1 mm in diameter). Meteorites consist mainly of silicate materials (stony meteorites) or iron (iron meteorites). It is estimated that the earth collects over 108 kg of meteoritic material every year, mostly in the form of micrometeorites. Micrometeorites survive atmospheric friction because their small size enables them to radiate away the heat generated by friction before they vaporize |
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