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5 Things Dark Matter Could Be - The Countdown #45

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Twenty-seven percent of the Universe is made of invisible dark matter. But what is it? In this episode, we cover the top five candidates that may fit the bill.

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SUBSCRIBE, future astronauts: http://goo.gl/bRbj4
Watch more of The Countdown: http://goo.gl/JnNep
Visit Scientific American's website for more space news and information: http://goo.gl/qXeIq

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More to explore:

Dark Matter & Dark Energy
http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/

Dark Matter & The Milky Way
http://www.scientificamerican.com/article/cosmic-web-dark-matter-simulations-help-solve-milky-way-mystery-video/

LUX Results
http://www.space.com/23395-dark-matter-eludes-scientists-lux-detector.html

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Credits:
Host/writer: Sophie Bushwick
Production Assistant: William Herkewitz
Editor: Kathryn Free
Producer: Eric R. Olson