Contact: Lee J. Siegel
University of Utah
Caption: In this time-lapse photo, stars appear to rotate above the Middle Drum facility of the Telescope Array, a $25 million cosmic ray observatory that sprawls across the desert west of Delta, Utah. Physicists from the University of Utah, University of Tokyo and elsewhere report the observatory has detected a "hotspot" in the northern sky emitting a disproportionate number of ultrahigh-energy cosmic rays, which are the most energetic particles in the universe. The discovery of a hotspot is a step in the long quest to discover the source or sources of the most powerful cosmic rays.
Credit: Ben Stokes, University of Utah.
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