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" ... In addition to observing positrons, AMS has observed other antimatter, including antiprotons and some antihelium nuclei. However, the experiment is able to detect more than antimatter. It can also study the flux of ordinary matter, from protons and electrons up to much heavier nuclei, including nuclear species as heavy as carbon and oxygen. Measurements of these heavy cosmic nuclei can help astronomers probe star formation, as well as the emission of heavy ions from stars. ... "
" ... The paper suggested that antimatter globular clusters might exist in the Milky Way. In these globular clusters, antimatter stars would go supernova and shoot anti-helium out into interstellar space. If that happened, the motion of antihelium would be affected by the magnetic field of the Milky Way and thus here on Earth, we’d detect antihelium, but not know where it originated. And we do detect a small amount of antihelium in cosmic rays from space – in fact, more than is predicted from more mundane sources. ... "