Rhea is Saturn's second-biggest moon, about 1,500 km wide.
It's a cold ball of ice with a little rock mixed in, covered in craters.
In 2010 Cassini found it wrapped in a whisper of oxygen and carbon dioxide, far too thin to breathe. It was the first time oxygen had been found around another world like this.
Rhea was discovered in 1672 by Giovanni Cassini, the astronomer the spacecraft was later named after.
- Width
- 1,528 km
- Goes round Saturn
- every 4.5 days
- One day
- The same: it always shows Saturn one face
- Temperature
- about −200 °C
- 70 kg on Earth weighs
- 2 kg here
