Super-luminal expansion in extragalactic radio sources

@article{Blandford1977SuperluminalEI,
  title={Super-luminal expansion in extragalactic radio sources},
  author={Roger D. Blandford and Christopher F. McKee and Martin J. Rees},
  journal={Nature},
  year={1977},
  volume={267},
  pages={211-216}
}
Very long baseline (VLB) investigations of compact extragalactic radio sources can often be interpreted in terms of two non-thermal components apparently separating with speeds in excess of the speed of light. Given the conventional physical laws and the cosmological interpretation of large redshifts, the available morphological evidence, while inconclusive, is most compatible with a general class of models in which a signal propagating with a speed close to that of light is scattered by an… 
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