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Meteorite Grains Trace Wandering Stars

ASTROPHYSICSMeteorites harbor tiny grains of stardust, made in other stars before the solar system formed. An astrophysicist now argues that the peculiar ratios of silicon isotopes in some of these grains show that their parent stars were born far from the sun's present location, close to the center of the galaxy. They then migrated outward before strewing the dust near the sun's birthplace.