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Cometary Surprise Found Inside Meteorite

17 Apr 2019, 04:23 UTC
Cometary Surprise Found Inside Meteorite
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An ancient sliver of the building blocks from which comets formed was discovered encased inside a meteorite like an insect in amber by a Carnegie-led research team. The finding, published by Nature Astronomy, could offer clues to the formation and evolution of our Solar System.Meteorites were once part of larger bodies, asteroids, which broke up due to collisions in space and survived the trip through the Earth's atmosphere. Their makeup can vary substantially from meteorite to meteorite, reflecting their varying origin stories in different parent bodies that formed in different parts of the Solar System. Asteroids and comets both formed from the disk of gas and dust that once rotated around our young Sun, but they aggregated at different distances from the Sun, affecting their chemical makeup. Compared to asteroids, comets contain larger fractions of water ice and far more carbon.By studying a meteorite's chemistry and mineralogy, researchers like the paper's lead author, Carnegie's Larry Nittler, can reveal details about its formation and how much heating and other chemical processing it experienced during the Solar System's formative years.A particularly primitive class of meteorites called carbonaceous chondrites are thought to have formed beyond Jupiter. One such meteorite, discovered in Antarctica's LaPaz ...

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