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What is panspermia

Explain the term panspermia?

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Panspermia is defined as the hypothesis which explains life over the earth as not begin from the planet. The idea states that the first living beings which colonized the earth arrive from the outer space, from other planets or even from other galaxies by traveling within meteorites, comets.  As per this hypothesis, even type of life now existent over earth would have also been seeded intentionally by the extraterrestrial beings in the other stellar and planetary systems.

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