
Fifty Years On, Apollo Moon Rocks Finally Reveal Their Magnetic Secret
A half-century of patience pays off as Oxford scientists solve the riddle of the Moon's vanishing magnetism
Somewhere in a laboratory at the University of Oxford, a small piece of the Moon sits under a light it has not seen for four and a half billion years. It is roughly the size of a thumbnail — grey, unremarkable, ancient beyond comprehension. And it has just answered a question that has nagged at planetary scientists since Neil Armstrong's crew brought it home.
Why were the Apollo Moon rocks magnetic?
The Moon, after all, has no magnetic field. It is a cold, quiet world with no molten churning core, no invisible shield deflecting the solar wind. Yet when NASA's astronauts returned from the lunar surface between 1969 and 1972, the samples they carried told a different story. Locked inside those rocks were unmistakable signatures of intense magnetism — evidence of a field that, at times, rivalled or even surpassed Earth's own.
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