Without water – it's safe – life on earth is not far. But how did the water hit the ground?
One well-known theory is that most of the water was again created by asteroids that hit the new land. The researchers concluded that this is because the chemical signature of the water is similar to that of asteroids and earth's oceans.
But now researchers have found evidence of another terrestrial source of water. It could be at least partly from the clouds of dust and gas from the new solar environment at that time. The team of Arizona State University Peter Buseck writes in Geophysical Research: Planets. In addition, researchers believe: our planet has much more hydrogen, water, than previously thought.
Buseck and colleagues argue that the consistent chemical signature of terrestrial and asteroid waters is not fully applied. Hydrogen in our planet, at the boundary between the Earth's shell and the nucleus, has a very different signature, so it's probably not asteroids. In addition, there will be some known rising gases in the Earth's shell, which are characterized by sunlight and gas clouds.
Therefore, researchers propose to extend the old theory. After several years, several watertight asteroids surrounded by the question – the darkness around the new sun, could have merged with the planet Earth. Sun-mist gases penetrated into the early atmosphere and absorbed by the magma oceans. The influence of other celestial bodies increased the amount of water and ultimately increased the Earth to its current size.
Even according to the new model, most of the earth's water comes from asteroids and only a small part of the gas and dust clouds around the new sun. Approximately one to two of every 100 water molecules return to the sun's fog, researchers say.
If it were similar to a US astronomer, it would have an effect on the exoplanet with water: it could have occurred in the theme – in the dark around its sun, even if there was no water from the asteroids.