| it's a different kind of particle | |
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| dark matter: An invisible, essentially collisionless component of matter that makes up about 25 percent of the energy density of the universe | Planck Collaboration 22 March 2013 |
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| Francis, Matthew 22 March 2013 | , Cal Tech, 2007, The Teaching Company, Dark Matter, Dark Energy: The Dark Side of the Universe, Guidebook Part 2 page 46, Accessed Oct |
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