Earth vs Io
Earth is about 3.5 times as wide as Io and Earth runs the hotter.
| Earth | Io | |
|---|---|---|
| Type | Rocky world | Rocky world |
| Size (radius) | 1.00 R⊕ | 0.29 R⊕ |
| Surface gravity | 1.00× Earth | 0.18× Earth |
| Equilibrium temperature | -19°C (-2°F) | – |
| Mean surface temperature | 15°C (59°F) | -163°C (-262°F) |
| Year (orbital period) | 365 days | 11.9 years |
| Distance from Earth | home | in our solar system |
| Earth-similarity index | 1.00 | 0.31 |
Common questions
Is Earth bigger than Io?
Earth is the larger of the two: Earth is 1.00 R⊕ across and Io is 0.29 R⊕, where Earth is 1 R⊕.
Which has stronger gravity, Earth or Io?
Earth pulls harder: surface gravity is 1.00× Earth on Earth and 0.18× Earth on Io.