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Studies of meteorites originating from inner Solar System bodies such as Mars and Vesta show that they have very different oxygen and tungsten isotopic compositions as compared to Earth, whereas Earth and the Moon have nearly identical isotopic compositions.The isotopic equalization of the Earth-Moon system might be explained by the post-impact mixing of the vaporized material that formed the two, Similarly, the newly formed Moon would also have been affected and had its own lunar magma ocean; estimates for its depth range from about 500 km (300 miles) to its entire depth (1,737 km (1,079 miles)).
This matching of apparent visual size will not continue in the far future, because the Moon's distance from Earth is slowly increasing.Afterward there were essentially only two groups: the giant impact camp and the agnostics.Giant impacts are thought to have been common in the early Solar System.In 2007, researchers from the California Institute of Technology announced that there was less than a 1% chance that Theia and Earth had identical isotopic signatures.The Moon is a differentiated body: it has a geochemically distinct crust, mantle, and core.This is thought to be due to the Moon having been amalgamated from two different bodies.
This hypothesis, although not perfect, perhaps best explains the evidence.
Since the Apollo 17 mission in 1972, the Moon has been visited only by unmanned spacecraft.
Within human culture, both the Moon's natural prominence in the earthly sky, and its regular cycle of phases as seen from the Earth have provided cultural references and influences for human societies and cultures since time immemorial.
The Moon is an astronomical body that orbits planet Earth, being Earth's only permanent natural satellite.
It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary).
Following Jupiter's satellite Io, the Moon is the second-densest satellite among those whose densities are known.