MAX-PLANCK-INSTITUT FUR EXTRATERRESTRISCHE PHYSIK / SCIENCE PHOTO LIBRARY MAX-PLANCK-INSTITUT FUR EXTRATERRESTRISCHE PHYSIK / SCIENCE PHOTO LIBRARY
Galactic centre. X-ray image taken by the ROSAT satellite of the centre of our galaxy, the Milky Way. The galactic centre lies in the direction of Sagittarius at a distance of about 28,000 light years from the Solar System. Many X-ray sources (bright circular spots) are seen here; most of them are still unidentified but are mainly thought to be associated with supernova remnants and X-ray binary star systems. The X-ray emission from these objects is probably powered by a massive black hole and an accretion disc, made up by very hot material, which forms around the black hole due to its strong gravitational pull.
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