NOVA scienceNOW | The Dark Matter Mystery | PBS

http://www.pbs.org/nova/sciencenow 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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Category:

Science & Technology

Tags:

• astronomy
• astrophysic
• Bullet
• Clowe
• Cluster
• cosmic
• dark
• Doug
• galaxy
• matter
• NOVA
• PBS
• Science