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Six days after Voyager's historic encounter, Triton's orbit brought it around once again in line with Neptune. The crescent image of Triton is seen here just as it began to pass in front of the crescent of Neptune. Because scattering by high-altitude aerosols is enhanced at large phase angles, the characteristic blue color of Neptune's atmosphere is suppressed. This picture was taken by Voyager 2 on 31 August 1989. See page 1422. [Photo courtesy of Brad Smith, University of Arizona, Tucson, AZ 85721]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)