Using modern techniques of digital
astronomy, we will repeat Hubble's
experiment. The technique we will
Figure 1: use is fundamental to cosmological
~ubble's Constant research these days. Even though
Hubble's first measurements were
made three-quarters of a century ago, we have still only measured the velocities and distances of a small fraction of the galaxies we can see, and so we have
only small amount of data on whether the rate of expansion is the same in all places and in all directions in the universe.
The redshift distance relation thus continues to help us map the universe in space and time.