Cancer: Blood vessels kept quiet

  title={Cancer: Blood vessels kept quiet},
  author={Andrew Vaughan Benest and Hellmut G Augustin},
black-hole system, but this is not the only possible explanation. Recently, evidence of a black-hole pair was claimed in another SDSS quasar, but the binary separation is much larger than that of Boroson and Lauer’s system and, again, the case is not closed. Catching black holes in a final embrace has proved extremely difficult. When the separation is small enough that merging seems inevitable, the limitations of today’s observatories make it hard to obtain an image that resolves the binary… CONTINUE READING