Galaxies
What Is Dark Matter? An Astrophysicist Explains | Ars Technica

We see evidence for dark matter everywhere we look but proving hypotheses around it has been exceptionally difficult. Astrophysicist Paul Sutter explains everything about this mystery in a way almost anyone can understand – what we know about dark matter, what don’t, and how we’re trying to find out more.
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Video courtesy of:
ESA and the Planck Collaboration
CC BY-SA IGO 3.0ESO/L. Calçada
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What Is Dark Matter? An Astrophysicist Explains | Ars Technica
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