Neutron star’s halo could help explain antimatter near Earth

NASA has identified a neutron star, Geminga, as a significant source of antimatter near Earth. This discovery helps explain the unexpected levels of antimatter detected. When a massive star explodes into a supernova, its core can become a neutron star, like Geminga, which emits electrons and positrons. These particles interact with starlight, creating gamma rays. Previously, the magnetic fields scrambled the gamma rays' paths, making it difficult to trace their origins. However, using Fermi data, scientists have now confirmed Geminga as a source of these positrons, contributing about 20% of those detected near Earth.

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