Abstract
In the first fifty years after Edwin Hubble announced a linear relationship between distances and redshifts of external galaxies, the accepted value of his constant dropped by (or the Universe expanded and aged by) a factor of 5 to 10. More recently, different groups, often using nearly the same data, have passionately defended distance scales that differ by about a factor of two. The sections of this review explore (1) the history of extragalactic distance scales, (2) the relationships between the Hubble constant, H 0, and other cosmological parameters, (3) types of distance indicators, (4) ways of measuring distances in practice, (5) values of H 0 reported recently on the basis of these methods, (6) the continuing discrepancies between the 'long' and 'short' distance scales, and (7) prospects for future convergence on a single, global value of H, so that we can all get back to doing other things. The units of the Hubble constant are km s-1 Mpc-1 (or reciprocal time), and no one now strongly favors any value outside the range 40–90 km s-1 Mpc-1 (time scales of 11–25 Gyr).
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Trimble, V. EXTRAGALACTIC DISTANCE SCALES: it H 0 FROM HUBBLE (EDWIN) TO HUBBLE (HUBBLE TELESCOPE). Space Science Reviews 79, 793–834 (1997). https://doi.org/10.1023/A:1004905101332
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DOI: https://doi.org/10.1023/A:1004905101332