PressTV...Scientists have debunked the idea that water on earth could have originated from comets citing the results from Europe's Rosetta mission. The results from the European Space Agency’s mission, whose robotic lander Philae landed on Comet 67P last month, showed that the water on the icy mass is different from the water on our planet, state-run BBC reported on Wednesday.
Some have concluded that water might have come from asteroids but more evidence is needed to prove that.
The vast majority of liquid on earth is composed of hydrogen and oxygen atoms but occasionally -- three in every 10,000 molecules -- a hydrogen atom is replaced with a deuterium one.
The mission has found that there is far more heavy water on Comet 67P than on our planet.
"It is more than three times higher than on the Earth, which means that this kind of comet could not have brought water to the Earth," said Professor Kathrin Altwegg from the University of Bern in Switzerland.
"If we compare the water in comets with the water we have on Earth, we can definitely say if the water on Earth is compatible with the water on comets," Altwegg noted.
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