Io
Io is a natural satellite of Jupiter, covered with active volcanoes and sulphur deposits.
3,643 kmMean diameterWorlds apart
Io vs Moon
What are they, and what does the difference actually look like?
Two things. One honest scale.
Meet the pair
What these two things are
Moon
The Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
3,475 kmMean diameterIo has about 1.05 times the mean diameter of Moon.
Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.
Measurements, assumptions & sources +
Io
Rounded mean-radius model of Io. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
NASA JPL — Planetary satellite physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Moon
Rounded mean-radius model of Moon. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
NASA JPL — Planetary satellite physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Change the comparison
Put something else beside it.
Measurement details
Why these numbers?
The visual compares mean diameter with mean diameter. The records below preserve each value’s basis and caveats.
Io
3,643 kmMean diameter · approximate
Rounded mean-radius model of Io. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
Moon
3,475 kmMean diameter · approximate
Rounded mean-radius model of Moon. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
- Comparing
- Mean diameter ↔ Mean diameter
- Relative size
- Io is larger on this measurement by a factor of about 1.05. Io's selected measurement is approximately 4.84% greater than Moon's.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Io is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
- Moon is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
There’s always another scale
Follow your curiosity.
SpaceIo3,643 kmIo is a natural satellite of Jupiter, covered with active volcanoes and sulphur deposits.SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.
SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.Side by side
Another point of view.
