XMM, or X-ray Multi-Mirror, is a space observatory launched by the European Space Agency (ESA) in 1999. It is designed to study X-rays emitted by high-energy objects in the universe, such as black holes, neutron stars, and supernova remnants. The observatory uses advanced technology to capture and analyze X-ray data, providing valuable insights into cosmic phenomena. The XMM observatory features three telescopes that focus X-rays onto detectors, allowing scientists to observe celestial events in great detail. Its mission has significantly contributed to our understanding of the universe, helping to answer fundamental questions about the nature of matter and energy in space.