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The unique measurements with the Hubble Space Telescope of Cepheid variable stars in nearby galaxies led to extragalactic distances that made the HST Key Project conclude that the Hubble constant is H 0 = 72 km s −1 Mpc −1 . The idea that H 0 is now known is widely spread among the astronomical community. Some time ago, we suggested that a strong selection effect may still exist in the Cepheid method, resulting in too short distances. Using a model similar to traditional bias corrections, wedoi:10.1051/0004-6361:20042144 fatcat:xyrsq3cohvhbjag7tecz6ihwoq