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Scientists may have identified echoes of ancient Earth

A group of scientists believe that a previously unexplained isotopic ratio from deep within the Earth may be a signal from material from the time before the Earth collided with another planet-sized body, leading to the creation of the Moon. This may represent the echoes of the ancient Earth, which existed prior to the proposed collision 4.5 billion years ago.

http://www.ecnmag.com/news/2014/06/scientists-may-have-identified-echoes-ancient-earth?et_cid=3986897&et_rid=54707988&location=top