Spaceflight Simulator Wiki

Planets Expansion Required
Some or all of the features on this page requires the Planets Expansion in-app purchase.

Io is the innermost and second smallest of the four Galilean moons of Jupiter. It is well known for its striking yellow terrain and high mountain peaks, like Venus. It needs the Planets Expansion DLC.

Io has a similar gravity to the Moon, which make landings very easy and returning to orbit.

Around Io

Io’s low gravity and proximity to Jupiter make it hard for Gravity Assists. Getting to orbit might take a lot to time to conduct.

A downside to Io’s high gravity, however, is that orbit insertion/circularization burns can be quite expensive.

Io’s volcanoes aren’t very tall, and any orbit(s) that does not go below 300 meters are safe.

Io’s Surface

The terrain is covered with a lot of volcanoes, but they are very close and shallower unlike Venus's mountains. Several volcanoes sometimes group together and form mountain ranges, unlike Venus's mountain ranges, which only consist a few mountains/volcanoes and between them are very steep valleys. THe volcanoes sometimes have multiple hills on them.

The mountainous terrain of Io can make it difficult to land. Make sure that your lander has a wide base and ample fuel to prevent tipping and find a flat spot (like a spot between volcanoes, the peak of volcanoes or hills), respectively.

Driving rovers on Io is difficult, if not impossible. Steep cliffs can cause your rover to flip or fall and sometimes be destroyed. The pieces would likely then slipoff from the steep angle of the volcanoes.

Parachutes won't work, because Io has no atmosphere. In real life, Io has an atmosphere but parachutes cannot be used.


Io’s rough mountain peaks and valleys.

A picture from the surface of Io, showing Jupiter. This feature has not been implemented as of yet.


  • Io’s yellow color comes from various sulfur compounds exuded by its volcanoes.
  • Like Mars and its moons, Io has its own terrain feature.
  • Io is named after a lover of Zeus, who was turned into a cow so her affair with him would be hidden from Hera, Zeus’ wife.
  • Io can be pronounced either as /ˈaɪ. oʊ/ (“EYE-oh”) or/ˈiː.oʊ/ ( “EE-oh)”.
  • From Io’s surface, Jupiter would appear 39 times larger than the Moon looks from Earth.
  • Io has a similar composition to the inner planets.
  • Io has volcanoes, but in game, they do not erupt.
  • Io is geologically active, due to the volcanoes that erupt constantly.
  • Io's erupting volcanoes can be also seen even the spacecraft is far away from it.