Saturn’s ‘Death Star’ moon has hidden ocean under its crust, say scientists

Calculations suggest a 45-mile-deep internal body of water lurks beneath Mimas's 15-mile-thick icy shell

A moon of Saturn that resembles the Death Star from Star Wars because of a massive impact crater on its surface has a hidden ocean buried miles beneath its battered crust, researchers say.

The unexpected discovery means Mimas, an ice ball 250 miles wide, becomes the latest member of an exclusive club, joining Saturn's Titan and Enceladus and Jupiter's Europa and Ganymede as moons known to harbour subterranean oceans.