See this site for many animations illustrating basic concepts in physics and astronomy, at both an introductory and advanced undergraduate level. You can browse by topic or search for relevant animations.
%0 Electronic Source %A Gallis, Michael %D January 8, 2009 %T PSU/SL Animations for Physics and Astronomy Portal %V 2017 %N 16 December 2017 %8 January 8, 2009 %9 video/quicktime %U http://phys23p.sl.psu.edu/CWIS/index.php
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