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Ethan Siegel is a theoretical astrophysicist, and the author of Beyond the Galaxy: How Humanity Looked Beyond Our Milky Way and Discovered the Entire Universe. Ethan blogs at Starts with a Bang, on Scienceblogs. Ethan fills us in on the history of the Universe, and matters dark. Or dark matter.
Which matters greatly.
Beyond the Galaxy: How Humanity Looked Beyond Our Milky Way and Discovered the Entire Universe