Saturn's moon, Tethys, is split by an enormous valley called Ithaca Chasma.

Illustration of a martian sunrise from within a deep canyon.

A blue shadow falls across the turquoise river waters of this canyon.

Sunrays shine down on mist over a canyon river in a desert wilderness.

Artist's concept of the Sun rising over Valles Marineris on Mars.

2014 Comet over Aromatum, Mars

Artist's concept of extrasolar planet Tau Bootis b over a hypothetical moon.

Cosmic seascape on another world.

A beautiful river reflects light rays coming down from the sky.

Lush tropical jungle, river systems and waterfalls on an alien planet.

Curiosity rover descending into Gale Crater on Mars.

A crescent Jupiter and volcanic satellite, Io, hover over the horizon of the icy moon of Europa.

valley, vale, ravine, valley, canyon, branch, twig