Mars vs Mercury
Mars is about 1.4 times as wide as Mercury and Mercury runs the hotter. Mars is the closer of the two to Earth, with an Earth-similarity index of 0.72.
| Mars | Mercury | |
|---|---|---|
| Type | Rocky world | Rocky world |
| Size (radius) | 0.53 R⊕ | 0.38 R⊕ |
| Surface gravity | 0.38× Earth | 0.38× Earth |
| Equilibrium temperature | -63°C (-82°F) | 167°C (332°F) |
| Year (orbital period) | 1.9 years | 88 days |
| Distance from Earth | in our solar system | in our solar system |
| Earth-similarity index | 0.72 | 0.54 |
Common questions
Is Mars bigger than Mercury?
Mars is the larger of the two: Mars is 0.53 R⊕ across and Mercury is 0.38 R⊕, where Earth is 1 R⊕.
Which has stronger gravity, Mars or Mercury?
Mars pulls harder: surface gravity is 0.38× Earth on Mars and 0.38× Earth on Mercury.