Presolar grains

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Presolar grains”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Kathryn Hynes, CC BY 2.0, via Wikimedia Commons.