New York (dpa) – where does the water come from? The American team has found evidence that it comes at least partly from dust clouds and gas clouds from the environment of the young sun.
Scientists also report in the Journal of Geophysical Research: Planets that our planet contains much more hydrogen – a part of the water – than previously thought.
So far is the usual theory that water from asteroids was brought, who struck the young land. Researchers have come to the conclusion that this is because the chemical signature of the water is similar to the chemical signature of the asteroid and ocean of the earth.
Hydrogen inside our planet, on the border of the earth's coat and core, has a very different signature, so it's unlikely to come from asteroids, scientists explain today to Petra Busecka of the Arizona State University. Besides, there would be some noble gases in the earth's mantle with characteristics typical of sun dust and gas cloud.
Scientists will therefore propose a new theory. According to this billions of years ago, several planted asteroids surrounded by material fog surrounding the ever-young sun could unite on the planet Earth. The solar nebula gases entered their early atmosphere and were absorbed by their magmatic oceans. The impact of other celestial bodies has brought more water and eventually increased the Earth to its present dimensions.
Even according to the new model, most of the earth's water would come from asteroids and only a small portion of the gas clouds and dust around the young sun. About one to two out of every 100 molecules of water returns to the solar nebula, the researchers estimate.
If it is, as the American astronomer predicts, it would have consequences for the likelihood that the exoplanets would have water: they could have formed in the turbidity area around their sun, even though the remote system was not entering the water through asteroids.