The hypothesis that "seeds" of life exist already all over the universe, and that life on Earth may have originated through these "seeds", driven by a steady influx of cells or viruses arriving from space via comets. It is a more limited form of the related hypothesis of exogenesis, which also proposes that life on Earth was transferred from elsewhere in the universe, but makes no prediction about how widespread it may be.
Panspermia
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Panspermia
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The hypothesis that "seeds" of life exist already all over the universe, and that life on Earth may have originated through these "seeds", driven by a steady influx of cells or viruses arriving from space via comets. It is a more limited form of the related hypothesis of exogenesis, which also proposes that life on Earth was transferred from elsewhere in the universe, but makes no prediction about how widespread it may be.