While researchers have been searching for other planets for many decades, it is already clear today what distinguishes us from the other satellites in our solar system: water. As the source of all life on Earth, it was water that ultimately played the decisive role in the development of intelligent species on the planet. But how did the so important water actually come to our planet? After all, in terms of history, for a long time the Earth was no different from the Moon or the other rocks in our solar system. With every discovery of similar planets in space, new theories emerge - but in the meantime scientists agree that they have found at least two plausible theories for the origin of water on Earth.
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