A new study shows that simple hand magnets erase a meteorite’s magnetic memory. A new MIT study reveals that hand magnets, commonly used by meteorite hunters and collectors to verify meteorites' identities, often erase the rocks' magnetic memory, thereby destroying valuable scientific data. The r
Black Beauty, or NWA 7034, is thought to have formed at a time when the Red Planet harbored a magnetic field, much like the Earth does today. If the rock bears any trace of Mars’ ancient field, this could give scientists valuable clues to the planet’s past climate and composition.
But a new MIT study finds that the same magnets used to identify a meteorite usually erase its magnetic memory. They show that exposure to a magnet can reorient a rock’s microscopic grains, undoing their original orientation and any trace of its magnetic origins. “There was an incredible record there, and a unique opportunity to understand the early history of Mars’ magnetism,” says study author Benjamin Weiss, professor of planetary sciences at MIT. “But we found it’s all been obliterated by magnets.”, the researchers hope to raise awareness in the planetary science community about the destructive effects of hand magnets. Weiss’ co-authors are MIT postdoc Foteini Vervelidou and France Lagroix of the Paris Institute of Planetary Physics.
“Our initial hope was that by testing as many [samples] of this meteorite as possible, we would end up finding a few non-remagnetized ones,” Vervelidou says. “Once we concluded that all of the samples we studied have been remagnetized, the motivation was to spread the word about the destructive effects of hand magnets.”In their new study, the team laid out the ways in which hand magnets can affect a rock’s natural magnetism.
“What we have in this paper is finally a clear, unambiguous work plan for establishing whether your rock has been hit by a magnet,” Weiss says.
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