Scientists think dark matter might come in two forms

Scientists have discovered excess gamma radiation at the Milky Way's center that could indicate dark matter particle collisions, but similar signals are absent in dwarf galaxies where dark matter should also exist. Researchers propose that dark matter may consist of two distinct particle types that must find each other to annihilate and produce gamma rays. This would explain why signals appear in the Milky Way, where both particle types exist in similar amounts, but not in dwarf galaxies where one type might dominate.