Presolar grains
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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 wh
Boeing Delta II rocket carrying the Stardust spacecraft waiting for launch. Stardust had a close encounter with the comet Wild 2 in January 2004 and also collected interstellar dust containing presolar interstellar grains.
Vial of suspended presolar grains from the Orgueil meteorite.
Oldest dated rocks
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The oldest dated rocks formed on Earth, as an aggregate of minerals that have not been subsequently broken down by erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of
Presolar grains
…presolar silicon carbide grains examined, one had formed 3 ± 2 billion years before the 4.6 billion year-old Sun. This would make some of the grains the oldest solid material ever discovered on Earth. Presolar grains are the solid matter that was contained in the interstellar gas before the Sun formed. The presolar component can be identified in the…
A sample of gneiss from the site of the Earth's oldest dated rocks (the Acasta River area of Canada). This sample has been dated at 4.03 billion years old.
The Moon rock "Big Bertha", collected on the 1971 Apollo 14 mission, contains an Earth meteorite that is 4 billion years old.
Fragment of Acasta Gneiss