Presolar grains
Presolar grains are any solid material formed before the coalescence of the Sun, the star at the center of the Solar System. This material is most frequently encountered as tiny grains incorporated whole into asteroids and comets.
Presolar grains are any solid material formed before the coalescence of the Sun, the star at the center of the Solar System. This material is most frequently encountered as tiny grains incorporated whole into asteroids and comets.
Presolar grains are any solid material formed before the coalescence of the Sun, the star at the center of the Solar System. This material is most frequently encountered as tiny grains incorporated whole into asteroids and comets.
Source: Wikipedia "Presolar grains" · CC BY-SA 4.0
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