A Temperature Change on the Moon

　　Astronomers can tell just how hot the surface of the moon gets. The side of the moon toward the sun gets two degrees hotter than boiling water. The night side reaches 243 degrees below zero.

　　In an eclipse, 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.

　　月球上的氣溫變化

　　天文學家們能準確說出月球表面的溫度：月球陽面的溫度比沸水高2度，其陰面溫度低到零下243度。

　　在月食時，地球的陰影投射在月球上，這時月球的溫度可以在瞬間下降300度。

　　像這樣的溫度驟變在地球上是不會發生的，但為什么會發生在月球上呢？天文學家們認為，月球的表面是塵埃，而地球上巖石能儲存太陽的熱量。當太陽下山時，巖石依舊保持溫暖，但月球上的塵埃不能存熱。所以當月球變得黑暗時，熱量便迅速消失，月球便變得不勝寒了。

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