• Mark Trodden Video about Expanding Galaxies and Types of Matter/Energy
  Research summary of old notions of the expanding universe and newer approach to explain how galaxies can to continue moving away from each other at ever-increasing velocities. Talks about Einstein's general theory of relativity -- movement being a curvature of space/time continuum (or something like this)
  in Public bookmarks with cosmology dark_energy dark_matter elementary gravity particle relativity video
  Note: Video spends too much time focused on Trodden and not enough on his slides, so you lose focus (and interest) while staring at him talking.
• The Hubble Diagram - Specific Information
  Teacher's Guide to Specific Sections Introduction Let students read through the Introduction on their own. Ask them why the discovery that the universe was expanding was so unexpected. Point out that its discovery required three separate threads to come together: Einstein's General Relativity, Slipher's measurements of redshifts, and the building of the new 100" telescope on Mount Wilson. Ask them how the three other lines of evidence support the big bang theory. Get them thinking about how different lines of evidence add up to support a scientific theory. Ask: what makes a good theory?
  in Public bookmarks with astronomy cosmology einsteins expanding redshifts relativity telescope universe

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