MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
X-ray binary. Artwork of an X-ray binary star system. Gas is being sucked from the giant blue star (left) by the intense gravity of a super- dense object (right) that could be a black hole or a neutron star. The gas forms an accretion disc around the smaller star. Extreme rotation speeds within the disc generate temperatures high enough for the emission of X-rays. Such X-ray sources were discovered when telescopes were used above the Earth's atmosphere. A giant blue star is a massive, short-lived star. Neutron stars and black holes are produced when massive stars exhaust their fuel and collapse under their own gravity to diameters of only a few kilometres.
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