The descent module unit Rosetta analyzed the composition of water vapor on the surface of a comet, and the data show that the deuterium content in it is much higher than the earth parameters.
On this basis, the agency specialists have concluded that the water on our planet is not brought comets and asteroids, which collide with Earth in the early stages of formation of the solar system.
However, other scientists are in no hurry to agree with that. Observations from orbiting telescopes show that other comets may contain water that is identical to the Earth’s at its isotopic composition.
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