The most recent data from the Rosetta mission indicate that the steam coming from the comet 67P / Churyumov-Gerasimenko is significantly different isotopic composition in relation to the water in Earth’s oceans. This seems like a comet exclude tested as a major source of water on Earth – informs the European Space Agency (ESA).
The question of the origin of water, in the seas and oceans is one of the major puzzles in the study of the creation of the Earth and life on it. The most popular hypothesis suggests that the source of water were comets and asteroids that hit in the early Earth.
Scientists mostly agree that the water must be supplied to Earth early in its formation. However it is not known what the category of small bodies in the solar system has contributed to this process. There are three main possibilities: asteroids in the main asteroid belt between Mars and Jupiter, comets from the Oort cloud (a hypothetical reservoir of comets at the very far edge of the solar system), comets from the Kuiper belt outside the orbit of Neptune.
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