Earth
Earth is the third planet from the Sun, and the only one known to support life. Abundant water, a protective atmosphere, and a magnetic field make Earth unique in the Solar System.
- Distance from Sun: ~150 million km
- Diameter: 12,742 km
- Orbital period: 365.25 days
- Mean surface temperature: ~15°C
- Moons: 1 (Moon, "Luna")
- Key feature: Only planet with liquid water and life
Quick Facts
Earth's atmosphere is about 78% nitrogen and 21% oxygen. The Moon stabilizes Earth's tilt, influencing tides and seasons. Home to 8 million+ known species, it's the only confirmed world with a biosphere.