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Presolar grains are tiny solid minerals that crystallized in the gas of ancient stars. These crystals are the oldest material ever handled by humans. Some, from the Murchison meteorite, belonged to a group of massive stars that perished hundreds of millions of years before the birth of our Sun.
Presolar grains are solid minerals, on the scale of nanometers to micrometers, that crystallized in the gassy outflows and ejecta of stars that existed before the Sun was born. These ancient crystals are the oldest material ever handled by humans.
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