Earth stamp

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Earth is the third planet from the Sun, the largest of the terrestrial planets and the densest in the Solar System. It is often referred to as ‘the world’ or ‘the Blue Planet’ and is alternatively known as Terra or Gaia, respectively the Roman and Greek goddess of the earth. Currently, Earth is the sole place in the universe known to sustain life and is home to millions of species, including humans. The planet has an atmosphere, ozon layer and magnetic field which fend off harmful solar radiation and helped early oceanic life-forms to adapt to survival on dry land. The Moon is Earth’s only natural satellite and its presence, proximity and size stimulate Earth’s oceanic tides, stabilise its axial tilt and slow its rotation.

Aphelion: 152,098,232 km
Perihelion: 147,098,290 km
Diameter at equator: 12,742 km
Rotation period (1 day): 24 hours
Orbital period (1 year): 365.25 days
Av. orbital speed: 29.78 km/s
Av. surface temperature: 15°C
Mass: 1
Satellites: 1 (the Moon)

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