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Chronicle of a Chondrule’s Travels

Chronicle of a Chondrule’s Travels. Comet particles collected by the Stardust mission contain chondrules and CAIs that formed at much higher temperatures than where the icy comet accreted

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Chronicle of a Chondrule’s Travels

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  1. Chronicle of a Chondrule’s Travels • Comet particles collected by the Stardust mission contain chondrules and CAIs that formed at much higher temperatures than where the icy comet accreted • These high-temperature objects must have formed closer to the Sun and moved out beyond the planets to the comet-forming region in the Kuiper belt • Analyses on one of these chondrule fragments, called “Iris,” reveals its history of formation and outward transport

  2. Chronicle of a Chondrule’s Travels–What's Jupiter Got to Do With It? • Oxygen isotopic composition of Iris is similar to terrestrial oxygen, confirming formation in the inner solar nebula • Aluminum-Magnesium isotope systematics place the formation age of Iris at least 3 Myr after CAIs • Iris must have moved out to the comet-forming region before Jupiter could have blocked its way • Timing implies Jupiter formed more than 3 Myr after CAIs

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