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Presolar grains
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==Terminology== Presolar grains are individual solid grains which condensed around distant stars or as part of [[novae]], and potentially [[supernovae]] outflows, which were accreted in the early [[Formation_and_evolution_of_the_Solar_System#Presolar_nebula|solar nebula]] and remain in relatively unaltered [[Chondrite|chondritic meteorites]]. As they were accreted before the formation of the Solar System, they must be '''pre'''solar. Presolar grains also exist in the [[interstellar medium]].<ref>{{cite journal |last1=Zinner |first1=E. |title=Presolar Grains |journal=Treatise on Geochemistry |date=2014 |pages=181β213 |doi=10.1016/B978-0-08-095975-7.00101-7 |isbn=978-0-08-098300-4 }}</ref> Researchers occasionally use the term ''stardust'' to refer to presolar grains, particularly in [[science communication]], though the term is sometimes used interchangeably in the scientific literature.
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