Science Weblecture for Unit 63
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Galaxies can be grouped into classes by their shape and energy output. Classifications in the last four decades have changed as our understanding of observational limitations changed.
Take a look at the chart of the the distance ladder at the David Darling Encyclopedia site. Follow links to explain terms like "moving cluster" and "main-sequence fitting" methods.
Read about the the classification of galaxies using Hubble's "tuning fork".
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