JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Boehm and Hooper, dark matter astrophysicists. Dr Celine Boehm (left) and Dr Dan Hooper have studied gamma rays from space that may show the existence of a type of dark matter. Dark matter is the non- visible matter thought to make up most of the mass of the universe. The Oxford University researchers studied observations by Integral, the ESA's gamma ray space telescope, of the centre of our galaxy the Milky Way. They propose that the annihilation of low-mass (relative to previous theories) dark matter particles and antiparticles can explain the distribution of gamma rays of a certain energy. Photographed in 2003. For a gamma ray model of the galactic centre, see image R806/101.
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