Abstract
A LONGSTANDING unresolved problem in galactic astronomy is the mass discrepancy observed in clusters of galaxies. The virial mass of the cluster per galaxy and the mass–luminosity ratio are considerably larger than the corresponding quantities for individual galaxies. This discrepancy cannot be a result of expansion or be because of the recent origin of clusters: these ideas contradict our present knowledge of the physical evolution and ages of galaxies1. Therefore it is necessary to adopt an alternative hypothesis: that the clusters of galaxies are stabilised by hidden matter.
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EINASTO, J., KAASIK, A. & SAAR, E. Dynamic evidence on massive coronas of galaxies. Nature 250, 309–310 (1974). https://doi.org/10.1038/250309a0
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DOI: https://doi.org/10.1038/250309a0
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