The asteroid broke away from a larger body and migrated toward Earth, a new analysis has revealed.
Unlike asteroid fragments that reach Earth's surface after tumbling through our planet's oxygen-rich atmosphere, the pieces of Ryugu were delivered to Earth in vacuum-sealed containers, so they had never been exposed to oxygen. Therefore, the team could assess the oxidation that the Ryugu samples had experienced.meteorites
Using spectroscopy, the researchers found another characteristic that distinguished the Ryugu samples: a large amount of pyrrhotite, an iron sulfide that is lacking in the dozen other meteorite samples they examined. "Our results and those from other teams show that these asteroid samples are different from meteorites, particularly because meteorites have been through fiery atmosphere entry, weatherization, and in particular oxidation on Earth," Michael Hu, a physicist at Argonne and a member of the research team, said in the statement."This is exciting because it's a completely different kind of sample, from way out in the solar system.
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