Astrobiologists have not yet found alien life on other planets. But the fossil record has evidence of aliens of another sort: the Ediacarans that lived on Earth millions of years ago.

Space & Earth - Earth Sciences

Dec 14, 2009 4.9 / 5 (12) 0

(PhysOrg.com) -- Princeton University scientists have shown that, in ancient times, the Earth's magnetic field was structured like the two-pole model of today, suggesting that the methods geoscientists use ...

Space & Earth - Earth Sciences

Oct 02, 2009 4.5 / 5 (11) 0