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NOVA scienceNOW | The Dark Matter Mystery | PBS

Duration: 04:38

We can’t see dark matter, and some skeptics doubt its existence, but many scientists think it makes up 20-some percent of our universe. Astronomer Doug Clowe explains how the Bullet Cluster, a group of galaxies billions of light years away, may shed some light on this mysterious stuff.

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Post Date: June 23, 2008