Earth's Hidden Guests: Strange Blobs in Deep Mantle Are the Remains of an Ancient Planet - SciTechDaily
* A 'Big Whack' Formed the Moon and Left Traces Deep in Earth, a Study Suggests The New York Times
* Remains of planet that formed the Moon may be hiding near Earth’s core Ars Technica
* Strange blobs in Earth's mantle are relics of a massive collision Nature.com
* 4.5 billion years ago, another planet crashed into Earth. We may have found its leftovers. National Geographic
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