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Superluminal expansion of quasar 3C273

Abstract

Maps of the radio structure of 3C273 show directly that it expanded with an apparent velocity 10 times the speed of light from mid-1977 to at least mid-1980.

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Pearson, T., Unwin, S., Cohen, M. et al. Superluminal expansion of quasar 3C273. Nature 290, 365–368 (1981). https://doi.org/10.1038/290365a0

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