Martian Morning Clouds Seen by Viking Orbiter 1 in 1976
Date: 17 Aug 1976
No NASA Mars orbiter has been in a position to observe morning daylight on Mars since the twin Viking orbiters of the 1970s. This image, taken by Viking Orbiter 1 on 17 Aug. 1976, shows water-ice clouds in the Valles Marineris area of equatorial Mars during local morning time. North is to the upper right, and the scene is about about 1,000 km (600 miles) across.
Although a few observations of Mars in morning daylight have come from the Viking orbiters and the European Space Agency's Mars Express orbiter, no mission has systematically studied how morning features such as clouds, fogs and surface frost develop in different Martian seasons in different parts of the planet. NASA's Mars Odyssey orbiter, in 2014, is in the process of changing its orbit to enable such systematic morning daylight observations.