Antimatter, a substance which annihilates matter on contact, has had it’s source discovered. Scientists have discovered that antimatter is created by stars being ripped apart by neutron stars and black holes. Apparently the center of the milky way galaxy has a cloud of antimatter about 10,000 light years wide. They don’t know whether it was exploding stars or dark matter that created the cloud.

The researchers calculate that a relatively ordinary star getting torn apart by a black hole or neutron star orbiting around it — a so-called “low mass X-ray binary” — could spew on the order of one hundred thousand billion billion billion billion positrons (a 1 followed by 41 zeroes) per second. These could account for a great deal of the antimatter that scientists have inferred, reducing or potentially eliminating the need for exotic explanations such as ones involving dark matter.

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