Hubble Brings Out Details of a Rare Double Einstein Ring

Credit: NASA/ESA/SLACS TEAM AND R. GAVAZZI AND T. TREU (UNIVERSITY OF CALIFORNIA-SANTA BARBARA)
The Hubble Space Telescope generated these images of a rare double Einstein ring, produced when a massive galaxy in the foreground forms a gravity lens that bends light from two more distant galaxies around itself. For it to work, the galaxies must be perfectly aligned. In this case, the foreground...

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