Moon Derives From Earth, Space Object, Study Says: Nat' Geographic.com

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SUMMARY

The recent study by German geochemists has advanced the understanding of the moon's origin, confirming that it derives from Earth. By analyzing trace element ratios in rocks from Earth, the moon, Mars, and meteorites, the research supports the theory that the moon formed from debris resulting from a colossal impact. This theory, initially explored during the Apollo missions, has gained traction but still faces questions regarding isotope distribution disparities among celestial bodies.

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"Science has a better understanding of how and when the moon came to be thanks to a team of German geochemists who compared ratios of trace elements in rocks from the Earth, the moon, Mars, and meteorites."

http://news.nationalgeographic.com/news/2003/08/0811_030811_earthmoon.html
 
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It's a theory that's been gaining ground for some time. I think the Apollo missions essentially first addressed it, so it's not a new theory.

However, I'm sure New Scientist mentioned not long ago something about a great disparity of certain isotope distributions across the earth, the moon, mars, and different forms of meteorite. You can be assured that this entire issue has not yet been satisfactorily addressed.
 
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