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Channels on Mars Suggest It Once Rained on the Red Planet

Channels on Mars Suggest It Once Rained on the Red Planet

From southernmost point of orbit over the South Pacific- all clouds seemed to be leading to the South Pole. Aug 3.  Credit: ‏Karen L. Nyberg

Karen L. Nyberg on

From southernmost point of orbit over the South Pacific- all clouds seemed to be leading to the South Pole. Aug 3. Credit: ‏Karen L. Nyberg

Recurring slope lineae are narrow (0.5-5 m wide), relatively dark-toned features that form on steep (25-40˚), southern-hemisphere slopes, and that appear in early spring, grow longer in the downslope direction during spring and summer, and fade during autumn and winter. NASA / JPL / UA / Emily Lakdawalla

Recurring slope lineae are narrow (0.5-5 m wide), relatively dark-toned features that form on steep (25-40˚), southern-hemisphere slopes, and that appear in early spring, grow longer in the downslope direction during spring and summer, and fade during autumn and winter. NASA / JPL / UA / Emily Lakdawalla

Southern polar cap of Mars as it appeared to the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) on April 17, 2000. In winter and early spring, this entire scene would be covered by frost. In summer, the cap shrinks to its minimum size, as shown here.

Southern polar cap of Mars as it appeared to the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) on April 17, 2000. In winter and early spring, this entire scene would be covered by frost. In summer, the cap shrinks to its minimum size, as shown here.

Opportunity Finds Minerals Deposited by Water on Mars | NASA/JPL-Caltech

Opportunity Finds Minerals Deposited by Water on Mars | NASA/JPL-Caltech

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