#Ryugu samples reveal traces of rock from before the #Sun existed
Small bits of material in the #asteroid contain #isotopes made in specific #stars.
Embedded in #clasts were tiny grains of rock made from stars that died before the Sun ever existed. “[The chemical makeup of] the primitive clasts compared to bulk Ryugu suggest that the clasts formed in a unique part of the protoplanetary disk enriched in presolar materials,” the research team said
https://arstechnica.com/science/2023/08/ryugu-samples-reveal-traces-of-rock-from-before-the-sun-existed/