Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pnas...90.4806t&link_type=abstract
Proceedings of the National Academy of Sciences of the United States of America, Volume 90, Issue 11, pp. 4806-4810
Physics
2
Scientific paper
Five methods of estimating distances have demonstrated internal reproducibility at the level of 5-20% rms accuracy. The best of these are the cepheid (and RR Lyrae), planetary nebulae, and surface-brightness fluctuation techniques. Luminosity-line width and D_n-σ methods are less accurate for an individual case but can be applied to large numbers of galaxies. The agreement is excellent between these five procedures. It is determined that Hubble constant H_0 = 90 ± 10 km\cdots-1\cdotMpc-1 [1 parsec (pc) = 3.09 x 1016 m]. It is difficult to reconcile this value with the preferred world model even in the low-density case. The standard model with Ω = 1 may be excluded unless there is something totally misunderstood about the foundation of the distance scale or the ages of stars.
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