XMM-Newton is ESA's X-ray observatory for studying hot gas, black holes, neutron stars, stellar explosions, and galaxy clusters. Three telescopes with nested gold-coated mirrors feed imaging cameras and high-resolution grating spectrometers, while an Optical Monitor records visible and ultraviolet light from the same targets. Its highly elliptical, approximately 48-hour Earth orbit permits long observations outside the radiation belts. Launched in December 1999, the mission combines sensitive X-ray spectroscopy with simultaneous observations at other wavelengths.
Schedule, status, and mission updates. Time-based alerts will start when a time is available.