Contact: Steve Koppes
University of Chicago
Caption: The South Pole Telescope uses a phenomenon called the Sunyaev-Zeldovich effect to pinpoint when dark energy became important in the history of the universe. The SPT measures the slight temperature difference associated with the SZ effect to produce an image of the gas in a galaxy cluster. The deep dark spot in the middle of the images is the SZ effect from a cluster of galaxies.
Credit: John Carlstrom/South Pole Collaboration
Usage Restrictions: News organizations may use this image in connection with reports about the University of Chicago's Kavli Institute for Cosmological Physics and the South Pole Telescope.
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