Old pictures showed wispy bright streaks across one side of Dione. When Cassini flew close, they turned out to be ice cliffs, hundreds of metres high.
They are cracks where the crust pulled apart long ago.
Scientists think a thin ocean may lie about 100 km under its surface.
Like Tethys, Dione shares its orbit with two small moons.
If you stood here
You could stand on top of a cliff of solid ice, looking out over a cratered plain, with Saturn hanging in the black sky.
- Width
- 1,123 km
- Goes round Saturn
- every 2.7 days
- One day
- The same: it always shows Saturn one face
- Temperature
- about −186 °C
- 70 kg on Earth weighs
- 2 kg here
