Contact: Carl Blesch
Caption: The Atacama Cosmology Telescope (ACT) in the Atacama Desert of northern Chile, with Cerro Toco volcanic peak in the background. Astronomers conducted a large, uniform survey of the southern sky with ACT, using a breakthrough technique that detects "shadows" of galaxy clusters on the cosmic microwave background radiation. The shadows pointed astronomers to previously unseen massive galaxy clusters.
Credit: Adam Hincks, Princeton University, University of Toronto
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