Study shows how water could have flowed on 'cold and icy' ancient Mars

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Research by planetary scientists finds that periodic melting of ice sheets on a cold early Mars would have created enough water to carve the ancient valleys and lakebeds seen on the planet today.
via Science Daily
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To keep Saturn's A ring contained, its moons stand united

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For three decades, astronomers thought that only Saturn's moon Janus confined the planet's A ring -- the largest and farthest of the visible rings. But after poring over NASA's Cassini mission data, astronomers now conclude that the teamwork of seven moons keeps this ring corralled.
via Science Daily
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Webcam on Mars Express surveys high-altitude clouds

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An unprecedented catalogue of more than 21 000 images taken by a webcam on ESA’s Mars Express is proving its worth as a science instrument, providing a global survey of unusual high-altitude cloud features on the Red Planet.

via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Webcam_on_Mars_Express_surveys_high-altitude_clouds