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Originally Posted by Shpoop
So, just curious here, what do you see? If light doesn't reflect off it, it isn't visible, but you cannot see through it, right? So then its just a big black blob, right?
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You're talking about dark matter still I assume?
Well for example with neutrinos, you don't see them. They are detected by sensors buried deep in the ice of Antartica. On the VERY rare occasion that a neutrino collides into matter, it gives off a tiny flash of light (yes all you physics folks out there, I know about muons, I'm simplifying
). Those sensors are looking for the light flashes. They're buried very deep in the ice because cosmic rays will produce the same light flashes, so the sensors have to be stuck somewhere where it can see deep into the earth where cosmic rays don't reach. It's called the AMANDA project (Advanced Muon And Neutrino Detector Array) if you're interested in learning more, there's a pretty good brocure here:
http://www.amanda.uci.edu/public_info.html