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Annular Eclipse of the Sun by Phobos Although Mars doesn’t experience total eclipses, spacecraft on the Martian surface have observed annular eclipses. This set of three images taken by NASA's Curiosity rover shows views three seconds apart as the larger of Mars' two moons, Phobos, passed directly in front of the Sun. NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.