Earth
Earth from Apollo 17
© NASA
It has one very large natural satellite, the Moon.
About 70% of the surface is covered in water.
It is the only planet known to have life on it.
| Facts and Figures | |
| Orbit | 149,600,000 km from the Sun or 1 AU |
| Radius | 6,378 km |
| Mass | 5.98 x 1024 kg |
| Length of Year | 365.25 Earth days |
| Length of Day | 24 hours |
| Surface Gravity | 1.0 g |
| Surface Temperature | about -80 to 50 °C |
