Comment on "Supergiant" Asteroid Shut Down Mars's Magnetic Field

"Supergiant" Asteroid Shut Down Mars's Magnetic Field

Mars's magnetic field may have been slowly weakened by four especially large impacts and then snuffed out completely by a fifth and final blow, experts say. Based on the number of large craters present, scientists think very early Mars suffered 15 or so giant impacts within a span of about a hundred million years.

 

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