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On Oct. 9, 2008, just after coming within 25 kilometers (15.6 miles) of the surface of Enceladus, NASA’s Cassini captured this stunning mosaic as the spacecraft sped away from this geologically active moon of Saturn. Craters and cratered terrains are rare in this view of the southern region of the moon's Saturn-facing hemisphere. Instead, the surface is replete with fractures, folds, and ridges--all hallmarks of remarkable tectonic activity for a relatively small world.

Craters and cratered terrains are rare in this view of the southern region of the moon's Saturn-facing hemisphere.

A mist of water ice crystals hangs in the "Grand Canyon of Mars," Valles Marineris. Observed by the Mars Express orbiter. ESA / G. Neuku...

The Grand Canyon in the Mars ! A mist of water ice crystals hangs in the "Grand Canyon of Mars," Valles Marineris. Observed by the Mars Express orbiter. ESA / G.

A mist of water ice crystals hangs in the "Grand Canyon of Mars," Valles Marineris. Observed by the Mars Express orbiter. ESA / G. Neuku...

The Grand Canyon in the Mars ! A mist of water ice crystals hangs in the "Grand Canyon of Mars," Valles Marineris. Observed by the Mars Express orbiter. ESA / G.