Eleven stellar streams have been identified, largely in the Milky Way's halo.
Science has come a long way. But we still don't understand everything about our universe — or ourselves.
This may be the source of dark matter.
There are more "anti-electrons" coming at us than there should be.
This dark matter theory doesn't sit well with everyone.
"It would be revolutionary for our fundamental understanding of the universe."
Physicists are on a quest to find dark photons.
It accounts for 85 percent of all matter — yet we've never directly observed it.
Wobbling galaxy clusters contradict current theories about the mysterious form of matter.
Get ready for a new kind of physics.
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