collision of two neutron stars, or ...



  It takes two (Oct 5)
  http://physicsweb.org/article/news/9/10/3

   Astronomers have observed X-rays and visible light from two short
   gamma-ray bursts for the first time. The observations suggest that the
   bursts are caused by the collision of two neutron stars, or a neutron
   star and a black hole.

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