Precious Metals On Earth May Have Come From Asteroids

Artist's impression of the Earth during the period of the terminal bombardment.
CREDIT: Julian Baum/Take 27 Ltd

Asteroids May Have Brought Precious Metals To Earth -- Live Science

The precious metals that we see on Earth today may be largely heavenly in nature, coming from the sky billions of years ago, scientists now find.

Back when the Earth was just forming, the materials that make up the planet were combining and differentiating into layers by weight — lighter materials floated to the surface and now make up Earth's crust, while heavier materials such as iron sank to the planet's interior.

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