There are several theories about where it really came from the Moon. Our best guess is that the Moon formed when Earth struck a large object, known as Theia. The collision had thrown a huge amount of debris into orbit, which eventually merged into one and formed the moon. But this theory has a problem.
Mathematical models show that much of the material that formed the moon had to come from the object that flew into it. But the samples obtained during the missions “Apollo”shows that most of the lunar material came from the Earth.
How the Moon formed? From the earth’s magma!
The work, which appeared early this week in Nature Geoscience offers a possible explanation. Research shows that the Earth at the time of impact was covered in hot magma, not the hard outer bark.
The magma is easier to dislodge from a surface than a solid crust, and that means to throw the material from the Earth into space would be easier, and he might subsequently solidify on the moon.
This theory largely depends on the time of formation of the moon. The earth needs to be warm to magma managed to take the desired shape, and then the theory will work. In addition, the new modeling still does not meet all the criteria by which observations of the moon will be matched by our theories. But this is an important step in the right direction.
I wonder will this theory to the study of the origin of the Martian satellites?
The latest theory is that Phobos and Deimos were supposed to appear after the collision of Mars with the ancient body is three times less than the red planet, after from 100 to 800 million years after its formation. According to scientists, the debris from this collision formed a very broad disk around Mars, consisting of a dense inner part of the coalescing of matter and a thin outer edge mainly of gas. In the inner part of this disk formed the moon a thousand times smaller than Phobos, which has since disappeared. The gravitational influence exerted on the external drive, gradually led to the fact that fragments of it gathered in the other, a small and distant moon. A few thousand years, Mars was surrounded by a group of about ten small satellites and one satellite more. After a few million years as soon as the disk of debris cleared, the tidal effects of Mars returned most of these satellites on the planet, including the big one. There were only two small moons, Phobos and Deimos.