Giant Impact Gave Birth to the Moon
Analysis of lunar samples returned by the Apollo astronauts confirms previous indications that the ratios of the different types, or isotopes, of oxygen in the Moon?s soil are similar to those of Earth. It is a finding that is consistent with the giant impact model for the Moon?s formation. Computer simulations offer additional proof of the theory that the Moon was born out of a big collision between the Earth and a Mars-sized planet.
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