| Mercury | Venus | Earth | Mars | Earth’s Moon | |
|---|---|---|---|---|---|
| Radius (km) | 2440 | 6052 | 6370 | 3388 | 1737 |
| Mass (Earth = 1) | 0.06 | 0.81 | 1.00 | 0.11 | 0.01 |
| (3.3 × 1023 kg) | (4.9 × 1024 kg) | (6.0 × 1024 kg) | (6.4 × 1023 kg) | (7.2 × 1022 kg) | |
| Average density (g/cm3) | 5.43 | 5.24 | 5.52 | 3.94 | 3.34 |
| Orbit period (Earth days) | 88 | 224 | 365 | 687 | 27 |
| Distance from Sun (× 106 km) | 57 | 108 | 148 | 228 | |
| Moons | 0 | 0 | 1 | 2 | 0 |