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Teaching tools > Pictures & facts > Overview: Earth facts > Fast Facts: Earth
| Age | About the same age as the Sun: 4.5 billion years |
| Location | Solar system |
| Avg. distance from the Sun | 149,600,000 km (92,960,000 miles) |
| Diameter | 12,760 km (7926 miles) |
| Mass | 5.972 x 1024 kg |
| Orbital period around the Sun | 1 year (365 days) |
| Number of moons | 1 |
| Distinguishing features | Earth is the only planet to have liquid water on its surface. Liquid water covers 71% of the surface. Its atmosphere is 77% nitrogen and 21% oxygen, with traces of other gases. White clouds of water vapor hide much of Earth's surface. |
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The southern hemisphere of Earth (image courtesy
of NASA)
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Teaching tools > Pictures & facts > Overview: Earth facts > Fast Facts: Earth