High-energy astronomy is a branch of astronomy that focuses on studying the universe using high-energy radiation such as X-rays, gamma rays, and cosmic rays. This type of radiation is emitted from some of the most extreme and energetic phenomena in the universe, such as black holes, supernovae, neutron stars, and quasars. High-energy astronomy allows scientists to study these phenomena and better understand the physical processes and conditions in these extreme environments. Researchers in this field often use specialized telescopes and detectors to observe and analyze high-energy radiation from space.