DR S C UNWIN / SCIENCE PHOTO LIBRARY DR S C UNWIN / SCIENCE PHOTO LIBRARY
Radio pictures of quasar 3C 273. Taken in July 1977, March 1978, June 1979 and July 1980, they show apparent faster-than-light, orsuperluminal, expansion of the quasar's jet. This picture has the dates and expansion distances marked.
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