January 11, 2022

On this date in 1787, only 6 years after his discovery of Uranus, William Herschel discovered Uranus’ largest moons Titania and Oberon. Almost nothing was known of these moons until Voyager 2 passed by in 1986. Even following this flyby, we still known little about these moons. What was discovered is they were geologically active in their distant pasts.

Voyager 2 image of Titania (left) and Oberon (right). Image credit: NASA/JPL.