Which never became full-flg planets

Approximately billion years ago, the solar system was a turbulent place — many celestial bodies appear in it [ 4 ]. Theia was one such protoplanet. It was about the size of Mars and consist of clouds of dust and gas [ 5 ]. Colliding with the Earth, it eject into space part of the substance of the earth’s mantle. Gravity complet the process: the eject debris began to rotate in near-Earth orbit and gradually gather into the moon. And the Earth as a result of the impact, among other things, chang the inclination of the axis of rotation.

The substance thrown out by the collision

The density of the lunar rock speaks in favor of this theory. The Moon consists mainly of light elements, and its density is, on average, less than that of Bahrain Phone Number List the Earth [ 6 ]. This does not contradict the impact theory: the Moon was partially form from the substance of the earth’s mantle, and not from the heavier and denser earth’s core. Another argument “for  along with the fragments of Theia, should have remain near the plane of the Earth’s revolution around the Sun – the ecliptic. It is in this region that the Moon now rotates. However, there are inconsistencies in the collision theory. According to most modern astronomical models.

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Institute propos an alternative collision

More than of the Moon should be made up of material from Theia. However, rock samples taken during the Apollo flights testify to the opposite: in terms USA CFO of composition, the Earth and the Moon almost do not differ [ 7 ]. It turns out that the Moon borrow practically nothing from Theia, and this contradicts the impact scenario. Theory of multiple collisions In 2017, Israeli researchers from the Weizmann theory. There were more than one blows to the Earth on it. Several collisions gave rise to about 20 small moons, which “stuck together” into the current Moon [ 8 ]. Thus, this theory.

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