由于彗星主要是由冻结的水和气体组成的冰，撞击地球的彗星将会蒸发。
Because comets are largely ice made up of frozen water and gases, a comet striking Earth then would have vaporized.
两个由天文学家组成的研究小组近日宣布发现了一颗名为APM 08279+5255的类星体，这颗类星体距离地球有120亿光年，其独特之处在于其水含量至少是地球上所有海洋水量总和的140万亿倍。
Two teams of astronomers announced the discovery of APM 08279+5255, a quasar 12 billion light years away that holds at least 140 trillion times the amount of water in all the Earth's oceans combined.
这时你会有疑问了，我们的地球表面75%由水组成，但是你知道吗？
When will you have doubt, our earth surface water comprises 75%, but do you know?
这时你会有疑问了，我们的地球表面75%由水组成，但是你知道吗？
When will you have doubt, our earth surface water comprises 75%, but do you know?
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