Answer
X-ray Astronomy is a branch of astronomy that uses X-rays to observe celestial objects. It was pioneered by Bruno Rossi in the 1960s, and has since become an important tool for studying the universe. X-rays are emitted by many objects in space, including stars, galaxies, and black holes. By studying X-rays, astronomers can learn about the physical properties of these objects, as well as their composition and evolution.