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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.
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