Tethys is one of Saturn’s 62 confirmed moons. Astronomers have long jokingly referred to the moon as the “Death Star” due to its resemblance to the planet-sized battle station from Star Wars. The large impact crater — known as Odysseus — is actually one of the largest in the entire Solar System. Tethys is roughly 660 miles across and the crater is nearly 280 miles wide, meaning the crater itself represents 5 percent of the moon’s total surface.