Did Earth eat the protoplanet it crashed into long ago?

A new study makes a compelling case for the origin of unexplained masses of underground rock causing changes to the Earth's magnetic field.

Credit: ordus/Adobe Stock
  • Many experts believe that the Moon was formed when a protoplanet named Theia crashed into the Earth 4.5 billion years ago.
  • One flaw in the theory has been that there's no remaining sign of Theia.
  • New research suggests that Theia's mantle was subsumed by Earth and that large anomalous blogs of rock deep within the Earth are its remains.
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