【#Tech24H】Cosmic rays are charged particles from outer space, primarily composed of various atomic nuclei, often called the "messengers" of major cosmic events. However, the origins of cosmic rays, especially high-energy and ultra-high-energy ones, have remained a mystery. On November 16, China’s Large High Altitude Air Shower Observatory (LHAASO) released new results indicating that microquasars, formed by interactions between black holes and companion stars, are powerful "particle accelerators." They can accelerate cosmic rays to energies at the "knee" and beyond, providing key observational evidence for the role of black holes in the origin of cosmic rays.