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What is the universe made of? If you answered stars, planets, gas and dust, you'd be dead wrong. Thirty years ago, scientists first realized that some unknown dark substance was affecting the way galaxies moved. Today, they think there must be five times as much dark... Science http://topdocumentaryfilms.com/through-the-wormhole-beyond-the-darkness/ http://topdocumentaryfilms.com/through-the-wormhole-beyond-the-darkness/ 170517