Abstract
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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