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Earth (or the Earth) is the third planet from the Sun, the fifth-largest and the densest of the eight planets in theSolar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as theWorld, the Blue Planet,^{[note 7]} or by its Latin name, Terra.^{[note 8]}

Home to millions of species^[16] including humans, Earth is the only place in the universe where life is known to exist. The planet formed 4.54 billion years ago,^[17] and life appeared on its surface within a billion years. Since then, Earth's biosphere has significantly altered the atmosphere and other abiotic conditions on the planet, enabling the proliferation of aerobic organisms as well as the formation of the ozone layer which, together with Earth's magnetic field, blocks harmful solar radiation, permitting life on land.^[18] The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist during this period. Without intervention, the planet could be expected to continue supporting life for between 0.5^[19] to 2.3 billion^[20] years, after which the rising luminosity and expansion of the Sun – as a result of the gradual but inexorable depletion of its hydrogen fuel – would eventually eliminate the planet's biosphere.^[21]aa

http://en.wikipedia.org/wiki/Earth