The moon has arisen from collision of the Earth with a wandering planet
the Moon Origin is one of riddles of planetary geology. Not so long ago scientists managed to find out that our planet and its natural companion consist of the same material. It excludes “ the capture theory “ according to which the Moon has arisen far from the Earth, but it has appeared in its orbit under the influence of terrestrial gravitation. Therefore now wins popularity “ the collision theory “: astronomers assume that 4,5 billion years ago the Earth has faced a heavenly body in size with Mars.
Usually consider that collision of the Earth with other object rotating about the axis should occur on rather low speeds and under a small corner. Explain it to that the splinters formed at blow, should remain in an orbit of the Earth, after all differently from them there would be no its natural companion. Besides, collision should be such that the Earth has kept the angular moment. It imposes additional requirements of heavenly bodies before their hypothetical collision: the quantity of a rotary motion at them could not exceed what the pair the Earth - the Moon now possesses.
It is admissible, really there was the heavenly body satisfying all this conditions. But here - that also is covered the main problem. Calculations show that at “ slow “ blow the great bulk of splinters of which the Moon should be formed, would have on a planet in size with Mars. If so why the isotope structure of the Moon and the Earth coincides? Where splinters of a wandering planet have got to?
In new research Andreas Rojfer from university of Bern (Switzerland) has assumed that the Earth is no time has faced the object exceeding it on the size, and blow has occurred on high speed. According to new model, “ fast “ blow has allowed to get rid of the garbage the unknown planet was which source. But splinters of the Earth remained in its orbit and in due course have turned to the Moon.
When Rojfer has simulated sliding collision of two planets, it has appeared that from 500 thousand fragments in Moon formation have taken part only 10 thousand. Where the others have got to? - They on - former where - that in space, and, probably, to astronomers will be possible to find out them, the scientist considers. To begin search it is possible from the meteorites which have got to the Earth rather recently.