World

Rhea

Rhea is Saturn’s second largest moon, a frozen dirty snowball of ice and rock, about 1 527 km across.

Key facts

Diameter

1 527 km

Goes round

Saturn

See it from here

Not by eye: Rhea is magnitude 10, the brightest of Saturn’s moons after Titan, and a small telescope will show it.

How the map draws it

Its colours come from infrared, green and ultraviolet pictures, toned down toward what an eye would see · lit as a camera exposed for its own sunlight would show it · seen from far off it is a light at its computed brightness: the glow is how a camera records a point too bright to resolve.