Evidence Of The Invisible

Dark Matter -- it's real! Or so says a group of scientists at the University of Arizona.

Using orbiting telescopes, the researchers watched two giant gas clouds in outer space collide over a 100-hour period. As the clouds clashed, they said, the visible gas particles slowed, pulling away from the invisible dark matter particles.

The researchers said they could detect the dark matter particles by their gravitational pull on the surrounding visible particles.

"This is the first time we've been able to show that (dark matter) has to be out there, that you can't explain it away," Clowe told Reuters. "We haven't actually been able to see the dark matter particles themselves, but what we have been able to do is... image the gravity that they're generating."

I'll be interested to see what the particle-physics people come up with to explain this invisible stuff.