プレソーラー粒りゅう子しMeanings1nounpresolar grainTechnical term in astronomy and cosmochemistry for microscopic dust grains that formed before the Sun and survived in primitive meteorites.隕いん石せきからプレソーラー粒りゅう子しが発はっ見けんされた。Presolar grains were discovered in the meteorite.
