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Submission + - A Guide to the Dark Side (

sciencehabit writes: Astronomers have made the largest map yet of dark matter in the universe. This invisible stuff gives off no light, but it does exert gravity on its surroundings. It probably consists of unknown elementary particles, and it's much more prevalent than the normal matter from which stars, planets, and people are made.
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A Guide to the Dark Side

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The two most common things in the Universe are hydrogen and stupidity. -- Harlan Ellison