Moon's magnetic material may have come from an asteroid

Researchers believe that a massive asteroid, whose impact left a 1,200-mile-wide crater, may explain why parts of the moon's surface have a magnetic field but others don't.

The moon's largest grouping of magnetic anomalies, on the left, is near the northern rim of the South Pole-Aitken basin, which scientists believe was created by the impact of a massive asteroid about 4.5 billion years ago. (Science/AAAS / March 9, 2012)
A giant crater at the moon's south pole may hold the answer to a long-standing mystery about why portions of the lunar crust have a magnetic field and other parts don't.
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