Photo: University of Tübingen
Scientists of Tubingen University in Germany and Nantes University in France found that an important role in the emergence of life on Earth played the meteorites that flew in from distant places in the Solar system. About it reported in a press release on Phys.org.
The researchers measured the isotope content of selenium in the rocks, which were formed by outpouring of magma at the Earth’s surface. The similarity of the isotopic composition of terrestrial rocks and meteorites indicates a cosmic origin of selenium, water, and other essential life-sustaining substances. According to scientists, discovered isotopes could be part of the mantle only after the formation of the core and the moon (from 3.9 to 4.5 billion years ago).
Previously it was thought that meteorites, which contributed to the formation of modern composition of the Earth mantle, came from the inner region of the Solar system. However, the content of the isotopes corresponded to the carbonaceous chondrites, which are found beyond the orbit of Jupiter. According to calculations, these celestial bodies were the source of 60 percent of all water on Earth, that is, the fall of meteorites on the planet was the only reason for the formation of the oceans and the conditions for the development of life.
Video, photo All from Russia.