Dark matter-hunting satellite detects low-energy signals
China's DAMPE satellite has found "mysterious" low-energy signals that scientists believe could help prove the existence of dark matter, thought to make up 27% of the universe. Although invisible to telescopes, dark matter's existence and properties are inferred from its gravitational pull on other objects. DAMPE has detected 1.5 million cosmic ray electrons and protons since its launch in 2015.