World

Tethys

Tethys is Saturn’s fifth largest moon, almost pure water ice, split by a chasm and a huge crater, about 1 062 km across.

Key facts

Diameter

1 062 km

Goes round

Saturn

See it from here

Not by eye: Tethys is magnitude 10.2, within reach of a small telescope, though Saturn’s glare beside it makes it hard.

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.