This section of the Sloan Digital Sky Survey's website provides an excellent explanation of how Astronomers are able to use red-shift to explain the expansion of the universe. An activity is provided for a user to retrace Edwin Hubble's steps of measuring magnitudes and calculating redshifts to make a Hubble Diagram.
These pages are part of a large set of projects and activities provided by the Sloan Digital Sky Survey for advanced astronomy students.
Sloan Digital Sky Survey. Sloan Digital Sky Survey: The Hubble Diagram. Seattle: Sloan Digital Sky Survey, February 11, 2007. http://cas.sdss.org/dr5/en/proj/advanced/hubble/ (accessed 11 December 2017).
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