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Ganymede. It's bigger than Mercury, has a liquid iron core and is the only moon in the Solar System with its own magnetic field. The terrain is varied, but there are broadly two different types: heavily-cratered dark regions (evidence of great age) and brighter regions showing patterns of ridges and grooves for thousands of miles, suggesting later geological activity, but nonetheless ancient. ©Mona Evans,"Jupiter's Galilean Moons" http://www.bellaonline.com/articles/art42279.asp

New Cassini Image: Saturn's moon Rhea with the planet's tiny moon Epimetheus Credit: NASA/JPL-Caltech/Space Science Institute; Processed image: G. Ugarković

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Inside the Soviets’ Secret Failed Moon Program

Russia's lunar craft lander from their failed space race to the moon

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Top 5 Bets for Extraterrestrial Life in the Solar System

Io-Jupiter's inner most moon is the most geologically active object in the Solar System

Our entire solar system in this little dot of the Milky Way galaxy. There are around 300,000,000,000 stars in the Milky Way galaxy alone. Each star having possibly one or more planets in orbit.

[astrogeology] A dramatic view of Phobos, one of the Mars' moons, and its largest crater Sticky, acquired by HiRES in March 2008. Fun fact: Phobos is closer to its planet than any other known moon, so close in fact that it orbits Mars faster than it rotates! Phobos' orbit lowers by one meter every century. Eventually it will collide with its planet or break up into a planetary ring. ~Al. A.