Evidence for the existence of Earths magnetic field has been pushed back about 250 million years, new research suggests.
The field may therefore be old enough to have shielded some of the planets earliest life from the suns most harmful cosmic radiation.
Source:
http://www.wired.com/wiredscience/2010/03/earths-magnetic-field-is-35-billion-years-old/
No comments:
Post a Comment