Facts About Earth:
- Earth is the largest of the terrestrial (rocky) planets, although it's only slightly larger than Venus.
- Earth is believed to have formed about 4.5 billion years ago. Life first appeared about 1 billion years later.
- 71% of the surface is water.
- Earth rotates once per day but its rotation is slowing down by 1.4 milliseconds per century. When the dinosaurs were around, a day lasted 23 hours.
- Earth orbits the Sun at a relative speed of 30 km/second.
- Earth's Moon is unusually large compared to the planet it orbits.
- About 100 tons of meteorite dust lands on Earth every day. On average a meteor the size of a car enters the Earth's atmosphere about once per year. Most burn up before hitting the ground.
- There are more than half a million pieces of space junk orbiting the Earth.
- Earth is the only planet we know of that has liquid water on the surface.
- Earth will remain habitable for somewhere between 500 million years and 2.3 billion years.
- More energy from the Sun hits Earth every hour than the planet uses in a year.
- People have known that the Earth is a sphere since at least 500 B.C.
- Although most astronomers expect to find signs of alien life one day, at this stage Earth is the only place in the Universe we know of that has life.
Classification: Planet, terrestrial (orbiting Sun)
Names: Sol 3, Terra, Papa-tū-ā-nukuSatellites: 1
Diameter: 12756.2 km
Circumference: 40030 km
Mass: 5.972e+24 kg
Surface Temperature: 287 K
Rotation period: 0.997 days
Rotation Velocity: 1674.4 km/h
Axial Tilt: 23.5000 °
Surface Pressure: 1013.25 hPa
Volume: 1080000000000 km3
Density: 5.5100 g/cm3
Surface Area: 510100000 km2
Surface Gravity: 1.0000 g
Escape Velocity: 11.1860 km/s