Hence, most of the collisional material sent into orbit would consist of silicates, leaving the coalescing Moon deficient in iron.The more volatile materials that were emitted during the collision probably would escape the Solar System, whereas silicates would tend to coalesce.
Theia's iron core would have sunk into the young Earth's core, and most of Theia's mantle accreted onto the Earth's mantle.
Using Newtonian mechanics, he calculated that the Moon had orbited much more closely in the past and was drifting away from the Earth.
This drifting was later confirmed by American and Soviet experiments, using laser ranging targets placed on the Moon.
Because of the thick crust of the far side, lunar magma cannot pierce through the crust there, causing less lunar maria while the near side of the Moon has a thin crust so that lunar magma can pierce through the crust resulting in the large maria we observe.
In 2001, a team at the Carnegie Institution of Washington reported the surprising finding that the rocks from the Apollo program carried an isotopic signature that was identical with rocks from Earth, and were different from almost all other bodies in the Solar System.The material in orbits around the sun stayed on its Kepler orbits, which are stable in space, and was thus likely to hit the earth-moon system sometime later (because the Earth-Moon system's Kepler orbit around the sun also remains stable).