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

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Recent research by German geochemists has advanced the understanding of the moon's origins, indicating it likely formed from Earth materials. By analyzing trace element ratios in rocks from Earth, the moon, Mars, and meteorites, scientists have gathered evidence supporting this theory. The concept has been evolving since the Apollo missions, though debates about isotope distribution disparities remain unresolved. Despite progress, questions about the specifics of the moon's formation continue to be a topic of scientific inquiry. Ongoing studies are essential to fully clarify the relationship between these 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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