Abstract
Radio data from four extragalactic sources, three quasars and one galaxy, show evidence for an apparent expansion faster than the speed of light. The data on these ‘superluminal’ sources are reviewed, and their implications briefly discussed.
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Cohen, M., Kellermann, K., Shaffer, D. et al. Radio sources with superluminal velocities. Nature 268, 405–409 (1977). https://doi.org/10.1038/268405a0
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DOI: https://doi.org/10.1038/268405a0
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