In this July 31, 2012 photo provided by Sanford Lab researchers work 

In this July 31, 2012 photo provided by Sanford Lab researchers work on the top floor of the Large Underground Xenon experiment at a shuttered gold mine in Lead, S.D.  The experiment, known as LUX, could begin collecting data on dark matter as early as February _ and, if all goes as planned, that data could answer age-old questions about the universe and its origins, scientists said Monday, Nov. 19, 2012. (AP Photo/Courtesy Sanford Lab, Matt Kapust)
Associated Press
In this July 31, 2012 photo provided by Sanford Lab researchers work on the top floor of the Large Underground Xenon experiment at a shuttered gold mine in Lead, S.D. The experiment, known as LUX, could begin collecting data on dark matter as early as February _ and, if all goes as planned, that data could answer age-old questions about the universe and its origins, scientists said Monday, Nov. 19, 2012. (AP Photo/Courtesy Sanford Lab, Matt Kapust)
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