| Mercury | Earth | |
| Mass | 0.06 | 1 |
| Diameter in miles | 3,031 miles | 7,926 miles |
| Diameter in kilometers | 4,878 kilometers | 12,756 kilometers |
| Average Distance from Sun in miles | 36,000,000 m. | 93,000,000 m. |
| Average Distance from Sun in kilometers | 58,000,000 km. | 149,600,000 km. |
| Average Orbital Speed in miles per second | 30 | 18.6 |
| Average Orbital Speed in kilometers per second | 48 | 30 |
| Rotation(spinning once) | 59 days | 24 hours |
| Revolution | 88 days | 365 days |
| Surface gravity | 0.38 | 1 |
| Atmosphere | helium (very thin) | nitrogen, oxygen |
| Satellites | 0 | 1 |