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Water is one of the most frequent molecules in the universe. After the big bang first hydrogen came into existence, whereas oxygen was fused much later in the stars. Within the clouds of the interstellar medium these elements combine to watermolecules. Earth got ist water either from the protoplanetary disk around the sun or from comets which smashed into the young earth. Which of these processes was the dominant one is still in the dark. 相似文献
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