Lost in migration: Earth's magnetic field overdue a flipSubmitted by Bob-45 on Thu, 10/04/2012 - 04:57
By Chris Wickham
LONDON | Wed Oct 3, 2012 8:18pm BST
(Reuters) - The discovery by NASA rover Curiosity of evidence that water once flowed on Mars - the most Earth-like planet in the solar system - should intensify interest in what the future could hold for mankind.
The only thing stopping Earth having a lifeless environment like Mars is the magnetic field that shields us from deadly solar radiation and helps some animals migrate, and it may be a lot more fragile and febrile than one might think.