A temperature change on the moon
文章来源:未知 文章作者:meng 发布时间:2009-10-28 06:41 字体: [ ]  进入论坛
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Astronomers1 can tell just how hot the surface of the moon gets. The side of the moon toward2 the sun gets two degrees hotter than boiling water. The night side reaches 243 degrees below zero.

In an eclipse3, the earth's shadow falls on the moon. Then the moon's temperature may drop 300 degrees in a very short time.

A temperature change like this cannot happen on the earth. Why does it happen on the moon? Astronomers think that the surface of the moon is dust. On the earth, rocks store heat from the sun. When the sun goes down, the rocks stay warm. But the dust of the moon cannot store heat. So when the moon gets dark, the heat escapes quickly. The moon gets very cold.

天文学家们能准确说出月球表面的温度:月球阳面的温度比沸水高2度,其阴面温度低到零下243度。

在月食时,地球的阴影投射在月球上,这时月球的温度可以在瞬间下降300度。

像这样的温度骤变在地球上是不会发生的,但为什么会发生在月球上呢?天文学家们认为,月球的表面是尘埃,而地球上岩石能储存太阳的热量。当太阳下山时,岩石依旧保持暖和,但月球上的尘埃不能存热。所以当月球变得黑暗时,热量便迅速消失,月球便变得不胜寒了。



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1 astronomers 569155f16962e086bd7de77deceefcbd     
n.天文学者,天文学家( astronomer的名词复数 )
参考例句:
  • Astronomers can accurately foretell the date,time,and length of future eclipses. 天文学家能精确地预告未来日食月食的日期、时刻和时长。 来自《简明英汉词典》
  • Astronomers used to ask why only Saturn has rings. 天文学家们过去一直感到奇怪,为什么只有土星有光环。 来自《简明英汉词典》
2 toward on6we     
prep.对于,关于,接近,将近,向,朝
参考例句:
  • Suddenly I saw a tall figure approaching toward the policeman.突然间我看到一个高大的身影朝警察靠近。
  • Upon seeing her,I smiled and ran toward her. 看到她我笑了,并跑了过去。
3 eclipse zklzW     
v.使黯然失色,使相形见绌,日食,月食
参考例句:
  • During the seventies,her acting career was in eclipse.在七十年代,她的表演生涯黯然失色。
  • There will be an eclipse of the moon next month.下个月有月食。
TAG标签: moon earth temperature
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