World
Io
Io is one of Jupiter’s four big moons, and the most volcanic world in the solar system, about 3 643 km across.
See it live
Where it is right now is on the live 3D map.
Key facts
- Diameter
- 3 643 km
- Goes round
- Jupiter
See it from here
Common binoculars show it as a point of light beside Jupiter; by eye it is lost in Jupiter’s glare.
How the map draws it
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.