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Scientists have shown that the Earth's surface became enriched with precious metals by impacting meteorites. The Earth's crust and mantle has considerably more gold than expected from favoured models of planetary formation. A study from the University of Bristol looked at some of the oldest rocks on Earth, demonstrating that gold was delivered by meteorites long after their formation...

2011-09-08

 meteorite gold Earth planet platinum core
Under extreme pressures and temperatures, one of the main materials of the Earth's interior has exhibited a never-before-seen transition...

2011-12-20

 metal core planet Earth pressure
Vesta is the only remaining example of the original objects that came together to form the rocky planets, like Earth and Mars, some 4.6 billion years ago.

2012-05-11

 asteroid Vesta rock iron core planet Solar System probe