Water-carved valleys may be relatively young, challenging assumptions about the history of the Red Planet's climate.
A new theoretical model suggests that ancient floods that carved canyons on Earth and Mars may have been much smaller but lasted longer than previously thought.
The discovery of dense concentrations of recurring flowlike features in two Valles Marineris chasms could aid in the search for life and influence future exploration of the Red Planet.
Temperature readings acquired from orbit show that Mars's surface gets cold enough at night to allow layers of solid carbon dioxide frost up to several hundred micrometers thick to build up near the equator.
The rover's neutron spectroscopy instrument hints at an unexpected trend: The upper soil levels in the layers of Gale Crater's Kimberley formation seem to hold more water-associated hydrogen.
The minerals identified by the Mars Reconnaissance Orbiter provide more evidence that the planet may have once been habitable.
The history of aluminum-rich basalts in Mare Frigoris may help scientists better understand the evolution of the lunar mantle.
Scientists assess the present and past habitability of Mars from organic compounds detected at Gale Crater.
Dunes, ridges, or something else? Scientists seek to understand the origins of transverse aeolian ridges.