How did the Earth: scientists have described the most likely scenario


                                Как родилась Земля: ученые описали самый вероятный сценарий

Neon earth’s mantle have suggested that our planet was formed quickly.

Isotopes of neon in the rock sediments on the ocean floor confirmed one of the scenarios of our planet’s formation 4.5 billion years ago. Depending on quickly or slowly the Earth formed from the solar nebula, the concentrations of these gases in the mantle would be different, say scientists from the University of California.

There are three hypotheses of the birth of the Earth from the protoplanetary disk. The first assumes that this process took place very rapidly during 2-5 million years. The second is that the planet formed from particles of Stardust, gradually getting thicker under the influence of solar radiation and privadas in planetesimal. Third — that the planet was formed slowly, and the water and gases brought to the surface by meteorites, the chondrites.

“We tried to understand how did the neon in the Earth’s mantle, to find out how fast the planet was formed and under what conditions,” explains Curtis Williams from the University of California.

Neon, in contrast to nitrogen and carbon dioxide, is inert and does not enter into chemical and biological reactions. “This means that it retains memory of where it was formed, even after 4.5 billion years,” utrolige study co-author Sujoy Mukhopadhyay. All three isotopes of this gas changes only the number of neon-21, because it is formed by radioactive decay of uranium.

Measure isotopes confirmed that the Earth’s mantle is present nebular neon that supports the theory of rapid formation of the Earth from the protoplanetary disk.

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