A Backwards Moon

At 1,680 miles across, the frigid and wrinkled Triton is distant Neptune’s largest moon. It orbits the planet backwards – that is, in the opposite direction that Neptune rotates – and is the only moon one of only two moons in our solar system to do so. This leads many astronomers to believe that Triton is…

From the LITD Archives: A Primordial Moon

A beautiful Cassini color-composite by Gordan Ugarkovic, this false-color image shows the ancient and heavily-cratered surface of Saturn’s moon Phoebe. Irregularly-shaped and bout 132 miles across, Phoebe is a fifteenth the size of our own moon but is believed to be much, much older. With its retrograde (backwards) orbit, high orbital incline and extremely dark,…