Scientists Detect Traces of an Ancient Alien World Beneath Earth's Mantle

Some 4.5 billion years or so ago, scientists believe, something big smacked into Earth and knocked it ass over teakettle.

Related Keywords

Hangzhou ,Zhejiang ,China ,United Kingdom ,Shanghai ,Chinese ,Pacific Ocean ,Zhongping Deng ,Chinese Academy Of Sciences ,Shanghai Astronomical Observatory ,Chinese Academy ,Hangzhou Sphere Studio ,Qian Yuan ,