Radio Astronomy Episode 9, Hydrogen and the Structure of Galaxies Episode 9, Hydrogen and the Structure of Galaxies.
Streaming video - 2017
Using the laws of physics and electromagnetic radiation, astronomers can "weigh" a galaxy by studying the distribution of its rotating hydrogen. But when they do this, it soon becomes clear something is very wrong: A huge proportion of the galaxy's mass has simply gone missing. Welcome to the topsy-turvy world of dark matter - which we now believe accounts for 90 percent of our own Milky Way.
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[San Francisco, California, USA] :
The Great Courses
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- 1 online resource (streaming video file) (32 minutes): digital, .flv file, sound
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