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| Description: Post–Main-Sequence Evolution (a) The luminosity of the Sun changes as our star evolves. It began as a protostar with decreasing luminosity. On the main sequence today, it gradually brightens. Giant-phase evolution occurs more rapidly, with faster and larger changes of luminosity. Note the change in scale of the horizontal axis scale at 12 billion years. Picture Stats: Views: 686 Filesize: 174.49kB Height: 900 Width: 983 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18429 |