| Neptune | Earth |
| Mass | 17 | 1 |
| Diameter in miles | 30,700 miles | 7,926 miles |
| Diameter in kilometers | 49,400 kilometers | 12,756 kilometers |
| Average Distance from Sun in miles | 2,749,100,000 m. | 93,000,000 m. |
| Average Distance from Sun in kilometers | 4,496,600,000 km. | 149,600,000 km. |
| Average Orbital Speed in miles per second | 3.4 | 18.6 |
| Average Orbital Speed in kilometers per second | 5.5 | 30 |
| Rotation(spinning once) | 19 hours, 10 minutes | 24 hours |
| Revolution | 164.8 earth-days | 365 days |
| Surface gravity | 1.14 | 1 |
| Atmosphere | hydrogen,heluim | nitrogen, oxygen |
| Satellites | 8 | 1 |