Cosmic Scale
Earth
Planet · 150 million km from the Sun
How big is Earth?
Earth is about 12,740 km across.
See Earth in 3D, at true scale
The only world we know that has liquid water on its surface, an oxygen atmosphere and life. Its magnetic field shields it from the solar wind, its large Moon steadies its tilt, and its plate tectonics keep recycling the crust.
At a glance
| Diameter | 12,740 km |
|---|---|
| Mass | 5.97 × 10²⁴ kg |
| Year | 365.25 days |
| Day | 23 hours 56 minutes |
| Surface | 71% water |
| Atmosphere | 78% nitrogen, 21% oxygen |
Good to know
- It is the densest planet in the Solar System.
- Its oxygen is biological: there would be almost none in the air without living things making it.
- Seen from Saturn, Earth is a single pale blue dot less than a pixel across.
- Next smaller: Venus · 12,100 km
- Next larger: Kepler-452b · 20,770 km