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Science in Seconds - Dark Matter

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Science in Seconds Know Everything RUMOURS - Dark Matter Rheanna Sand: Dark matter is mysterious and dark. But mostly, mysterious. It's so mysterious that reports of just a few positive signals in a Minnesota detector jolted the pulse of the physics community, and with reason. Experimental evidence of dark matter has eluded scientists since it was first postulated in 1933. There's only been indirect evidence, like the bending of distant starlight, the extra heaviness of galaxies, echoes in the cosmic background, and other odd effects. But what is dark matter? Well, that's the thing, we really don't know. We do know that according to all the data we have, dark matter and dark energy combined make up about 95 percent of the universe. But dark matter does not emit or absorb light, so its existence cannot be confirmed or denied. Most have faith, but there are some who refuse to believe and have found ways to do the math without it. But now, detectors made of germanium metal cooled to almost absolute zero have measured collisions that could be the best evidence of dark matter yet. After filtering out the immense amount of background noise, researchers found heat and charge signals that would be expected if dark matter particles were scattering inside the metal. A small discovery? Yes. But the excitement is palpable. Detecting dark matter is only the first step in what could be a very deep understanding of the structure of the universe. Discoveries like these could help us see the true fullness of what we think of as empty space. And some scientists think if we learn enough, we might even figure out why time only goes forward. But then again, can one ever really understand the darkness? Courtesy of Science in Seconds – All rights reserved Only for educational/non-profit purposes. (Translators are invited to put their name here)

Video Details

Duration: 2 minutes
Year: 2010
Country: United States
Language: English
License: All rights reserved
Producer: Science in Seconds
Director: Science in Seconds
Views: 49
Posted by: tradottiinitaliano on Sep 10, 2011

Can you see it? Neither do we. But 95% of the Universe is made out of it.

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