It turns out the Milky Way may be producing much more antimatter than previously thought

A new analysis by astronomers regarding antimatter signals emanating from the Milky Way Galaxy has revealed a picture that challenges existing models. According to a study by Thomas Siegert of Julius Maximilian University of Würzburg in Germany and Hiroki Yoneda of Kyoto University in Japan, our galaxy may be producing much more antimatter than previously calculated.

The researchers examined data collected by the European Space Agency's (ESA) INTEGRAL space telescope between 2002 and 2025 to create a detailed map of gamma-ray emissions resulting from the collision of antimatter and matter. The findings were published in the journal Astronomy & Astrophysics.

The most striking result of the study was the report that this gamma-ray signal was detected outside the Milky Way for the first time. The researchers suggest this indicates that antimatter particles may be escaping the galaxy and annihilating upon colliding with matter in intergalactic space.

GAS CLOUDS EMERGE AS THE SOURCE OF THE SIGNAL

The analysis indicated that the strongest signal came from the Complex C region, known as a giant hydrogen gas cloud falling toward the Milky Way. It was noted that a similar signal was also received from the Magellanic Stream, a trail of gas left behind by the Magellanic Clouds in orbit around the Milky Way.

Since these regions are not expected to produce intense antimatter on their own, the possibility that the particles may have been transported out of the Milky Way is gaining strength. If this interpretation is confirmed, current calculations regarding the galaxy's antimatter production capacity will need to be revised.

According to the new findings, the Milky Way may be producing approximately 100 tredecillion positrons per second, a rate about 2 to 3 times higher than previous estimates. Positrons are known as the antimatter counterparts of electrons; when they encounter normal matter, they annihilate each other, emitting gamma rays.

According to Siegert's assessment, current scientific models are insufficient to explain this intensity. Known sources such as radioactive elements left over from supernova explosions, black holes, and neutron stars are not expected to account for this amount of production on their own.

The research deepens the long-standing debate over antimatter signals coming from the center of the Milky Way while also demonstrating the need for new observations regarding particle production in galaxies and matter-antimatter interactions.