How long is a day on Iapetus?

About 1903.7 Earth hours · orbits Saturn every 79.3 days

The two-toned moon - one side is black as coal, the other bright as snow

Iapetus is the solar system's yin-yang symbol - one hemisphere is BLACK (dark as asphalt) while the other is BRIGHT WHITE (like fresh snow). Scientists think the dark side is coated in debris from outer moons!