Collapse in Hebes Chasma on Mars. The above image, taken by the robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing.
Saturn, photographed by Cassini. In what some call “the most stunning photograph ever taken”, the Cassini probe captured Saturn backlit by the Sun. What's more stunning is that Earth is visible in this photo, as a tiny dot just above the rings on the left.
Io, one of Jupiter's many moons and larger than our own. With over 400 active volcanoes, Io is the most geologically active object in the Solar System. This extreme geologic activity is the result of tidal heating from friction generated within Io's interior as it is pulled between Jupiter and its moons Europa, Ganymede and Callisto. Several volcanoes produce plumes that climb as high as 300 miles above the surface. Io has more than 100 mountains, some of which are taller than Mount Everest.