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想像一下,假如地球陆地被冰雪覆盖而海洋结冰至赤道,地球就像一个掉入白茫茫的雪地中的雪球,而且这个雪球持续存在了几百万年。这段说明并不是幻想,因为这种情况曾于8亿年和5.5亿年前之间发生过不是一次而是至少两次。在超常的气候活动条件下,地球曾变成“像雪球一样的地球”。为什么太阳不起作用,使这种严寒的冰川时代得以延续那么几百万年?这个问题至今还是一个谜。有人推测,大概是因为太阳有时突然降温或者说地球轴心倾斜或地球突然脱开轨道以致一下子减少了接受太阳的光照。法国
Imagine if the earth was covered in ice and snow and the ocean icy to the equator, the earth was like a snowball falling into the vast white snow, and the snowball persisted for millions of years. This description is not an illusion, as it happened once and twice at least 800 million years ago and 550 million years ago. Under unusually climatic conditions, the Earth has become “a globe like a snowball.” Why the sun does not work, so that this cold glacier era to extend millions of years so far? This question is still a mystery. It is speculated that presumably a sudden drop in the sun’s temperature or the inclination of the Earth’s axis or the sudden dislocation of the Earth would suddenly reduce the amount of light it receives from the sun. France