You thought Saturn's 146 moons were impressive? Think again. The ringed planet's moon count has nearly doubled with the ...

When Giovanni Cassini discovered Iapetus in 1671, he noted that the moon had one side much darker than the other, as he could only see Iapetus when it was on the west side of Saturn. Iapetus also ...

One of those moons is two-toned Iapetus, which has a light and a dark hemisphere. The moon rotates as it orbits the planet, changing brightness depending on which side is facing Earth. At eastern ...

The arcs near the center are the orbits of Titan and Iapetus, two of Saturn's large outer moons. For scale, the white circle under the scale bar is the orbit of the moon around the Earth.