Cosmic Scale
Rhea
Moon of Saturn · 527,108 km from Saturn
How big is Rhea?
Rhea is about 1,528 km across.
Rhea is Saturn's second-largest moon, a heavily cratered ball of ice with a little rock. It is cold, old and quiet, its surface little changed for billions of years.
At a glance
| Diameter | 1,528 km |
|---|---|
| Mass | 2.31 × 10²¹ kg |
| Diameter compared with Earth | 0.120 × Earth |
| Size | 1,527 km |
| Orbits | Saturn, every 4.5 days |
| Discovered | 1672, Giovanni Cassini |
| Visited | Cassini, 2004–2017 |
Good to know
- Cassini found a thin atmosphere of oxygen and carbon dioxide around it.
- It may once have had a faint ring, but later searches did not confirm it.
- It is the ninth-largest moon in the Solar System.