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Four faces of Mars as seen on 30 March 1997 by the Hubble Space Telescope. In order of upper-left, upper-right to lower-left and lower-right, Mas has rotated about 90° between each. Upper left [Image Date: 20-05-97] [97.06.002-001]
CREDIT
Phil James - University Toledo; Todd Clancy, Space Science Institute, Boulder, CO, USA; Steve Lee, University of Colorado, USA; ESA/NASA