Saturday, April 21, 2012

missing dark matter

Spotted an interesting article over at Astronomy magazine. The title caught my eye: New study finds mysterious lack of dark matter in Sun’s neighborhood.

The prevailing theory was that dark matter is all around us. Our "neighborhood" was expected to be filled with the invisible stuff. But astronomers in Chile, measuring the motions of over 400 stars up to 13 000 light-years away, reported that observational evidence does not support this. The mass derived from the visible material matches. There's no "extra" mass.

Then the article said, "This may mean that attempts to directly detect dark matter particles on Earth are unlikely to be successful." And I thought of all the experiments at the SNO LAB. What if they don't detect anything?

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