The Hubble Constant

Details The Hubble Constant The Hubble Constant

2007-09-25

arxiv.org/abs/0709.3924v1

Living Rev.Rel.10:4,2007

Astronomy and Astrophysics

Astrophysics

Scientific paper

I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance. In the last 20 years, much progress has been made and estimates now range between 60 and 75 km/s/Mpc, with most now between 70 and 75km/s/Mpc, a huge improvement over the factor-of-2 uncertainty which used to prevail. Further improvements which gave a generally agreed margin of error of a few percent rather than the current 10% would be vital input to much other interesting cosmology. There are several programmes which are likely to lead us to this point in the next 10 years.

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