Astronomers detect potential antimatter annihilation beyond the Milky Way

A new study published in Astronomy & Astrophysics suggests that the Milky Way may be leaking antimatter into intergalactic space. Researchers using data from the European Space Agency’s INTEGRAL telescope have identified potential gamma-ray signatures produced when positrons—the antimatter counterparts to electrons—collide with ordinary matter outside our galaxy.

When antimatter and matter meet, they annihilate, converting mass into energy in the form of gamma-ray photons, specifically at a characteristic energy of 511 kiloelectronvolts (keV). While mapping these emissions, astronomers found that the central regions of the galaxy produce far more positrons than can be explained by known energetic sources such as black holes or neutron stars. The findings suggest these particles may be escaping the galaxy and annihilating in the surrounding darkness of space.