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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"

Saturn's largest moon, Titan. NASA's Cassini spacecraft.

Callisto, one of Jupiter's moons

from Etsy

1887 Antique Diagram of the Solar System

The Solar System

Mars has a blue sunset - WTF fun facts

Jupiter's Europa, taken by the Galileo spacecraft

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