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Originally posted by Phage
reply to post by Totalstranger
The Giant Impact theory says that the impact occurred when the Earth was still semi fluid. When the smaller planet hit Earth the impact was so great that it essentially remelted both planets. Most of the core and heavier material of the smaller planet merged with Earth. The remaining, mostly lighter, debris formed a disk around the Earth. The disk coalesced and formed the Moon.
In a nutshell, much of the small planet became part of Earth. The moon is composed of parts of both.
Originally posted by Jim Scott
The Moon is much older than the Earth or the Sun, by at least one billion years. The material from the Moon was tested in labs on Earth. Surface rocks dated around 4.5 billion years, but the soil deeper tested over a billion years older. The Moon is not from the Earth or from our own solar system. It is foreign to our solar system.
The oldest dated moon rocks, however, have ages between 4.4 and 4.5 billion years and provide a minimum age for the formation of our nearest planetary neighbor.