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Earth

  Earth is a watery planet –70 per cent of its surface appears blue –and the only one that can support life. From space, astronauts have observed cities, forest fires, roads, airports, dams and other large structures, such as the Great Pyramid and the Great Wall of china.



Diameter: 12,756.3km

Mass: 59,720,000,000,000 tonnes

Average distance from Sun: 149,600,000 km

Rotation: 0.99727 days

Orbit: 365.256 days

Average temperature: +15 ◦C

Moons: 1
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