The Big Splash Theory is the current theory that explains the formation of the Moon. This theory states that approximately 4.5 billion years ago, the Moon was formed as a result of an object approximately the size of Mars colliding with Earth, causing less dense portions to be blasted into space. The clash created high temperatures and pressures, which in turn caused denser materials (like Iron) to become part of the Earth’s core. The less dense materials were blasted into space adding to the material orbiting the Earth. These less dense portions gravitated toward each other, creating the Moon. Evidence supporting the Big Splash Theory came from rock and soil samples taken during the Apollo landings on the Moon.
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Visual Representation of The Big Splash Theory
Clinton's Astronomy Blog 