A 300 Year Old Mystery Solved: Why Saturn's Moon Iapetus Is Half-Light, Half-Dark
In 1671, the famed astronomer Giovanni Cassini was observing Saturn when he found a new, faint moon orbiting it along its western side. As he attempted to follow its orbit, however, he found something incredibly unusual: the moon was completely invisible when it ought to have been along Saturn's …
Tanner Overcash flipped this story into read later•3189d