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[DIGEST: New Scientist (1, 2), The Atlantic (1, 2), Royal Astronomical Society]

A recent simulation reveals that half of the matter in our galaxy came from the stellar winds of supernova explosions up to a million light years away. A team of astrophysicists from Northwestern University in Illinois discovered that cosmic rays, which are charged particles ejected from the centers of stars during supernovae at nearly the speed of light, are responsible for transporting this material between galaxies.

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