Ancient rock's magnetic field shows that moon once had a dynamo in its core

(PhysOrg.com) -- The collection of rocks that the Apollo astronauts brought back from the moon carried with it a riddle that has puzzled scientists since the early 1970s: What produced the magnetization found in many of those rocks?

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<p><a href="http://www.physorg.com/news151251106.html">Ancient rock's magnetic field shows that moon once had a dynamo in its core</a></p> <p>(PhysOrg.com) -- The collection of rocks that the Apollo astronauts brought back from the moon carried with it a riddle that has puzzled scientists since the early 1970s: What produced the magnetization found in many of those rocks?</p>