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Earth

Earth (or the Earth ) is the third [planet] from the [Sun] , and the fifth-largest of the eight planets in the [Solar System] . It is also the largest, most massive, and densest of the Solar System's four [terrestrial planet] s. It is sometimes referred to as the [World] , the Blue Planet, or by its [Latin] name, .

Home to millions of [species] , including [human] s, Earth is the only place in the [Universe] where life is known to exist. The planet formed [4.54 billion years] ago, 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 organism] s as well as the formation of the [ozone layer] which, together with [Earth's magnetic field] , blocks harmful radiation, permitting life on land. The physical properties of the Earth, as well as its geological history and orbit, have allowed life to persist during this period. The world is expected to continue supporting life for another 1.5 billion years, after which the rising luminosity of the Sun will eliminate the biosphere.

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