Earth is the third planet from the Sun, and the fifth-largest and the densest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestialplanets. It is sometimes referred to as the World,the Blue Planet, or by its Latin name, Terra.
Home to millions of species including humans, Earth is the only place in the universe where life is known to exist. The planet formed 4,54billion years ago, and life appeaerdon its surface within a billion years.
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