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一夫二妻--地球曾被两个月球环绕?

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小编摘要:众所周知,月球总是只有一面面对着地球,这一面比较平坦,但是另一片却凹凸不平,有很高的高山。为什么呢?也许是因为小月球撞击了月球的背面造成的呢。

导读:研究人员说,四百万年前,曾有与火星大小相似的星球与地球撞击,碎石形成了月球。据推测,月球形成的同时,另一个小月球也形成了。但是,受到地球和大月球引力的影响,小月球最终撞击到大月球而消失殆尽。众所周知,月球总是只有一面面对着地球,这一面比较平坦,但是另一片却凹凸不平,有很高的高山。也许小月球的撞击是月球另一面不平坦的原因吧。

A new theory suggests the Earth once had a small second moon that perished in a slow motion collision with its "big sister".

Researchers suggest the collision may explain the mysterious mountains on the far side of our Moon.

The scientists say the relatively slow speed of the crash was crucial in adding material to the rarely-seen lunar hemisphere.

Details have been published in the journal Nature.

The researchers involved hope that data from two US space agency (Nasa) lunar missions will substantiate or challenge their theory within the next year.

For decades, scientists have been trying to understand why the near side of the Moon - the one visible from Earth - is flat and cratered while the rarely-seen far side is heavily cratered and has mountain ranges higher than 3,000m.

Various theories have been proposed to explain what's termed the lunar dichotomy. One suggests that tidal heating, caused by the pull of the Earth on the ocean of liquid rock that once flowed under the lunar crust, may have been the cause.

But this latest paper proposes a different solution: a long-term series of cosmic collisions.

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2011-08-04 10:30 编辑:Day_Day_Up1990
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