The Aquatic Ape Hypothesis
The aquatic ape hypothesis is the controversial idea that human ancestors went through a phase of living partly in water, and that this shaped many…
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Panspermia
Panspermia is the hypothesis that life exists throughout the universe and is spread between worlds by space dust, meteoroids, asteroids, and comets.…
The Gaia Hypothesis
The Gaia hypothesis proposes that life and its physical environment on Earth form a single, self regulating system that keeps the planet suitable for…
The Rare Earth Hypothesis
The Rare Earth hypothesis proposes that complex, multicellular life, of the kind found on Earth, is extremely rare in the universe, because it…
Abiogenesis: The Origin of Life
Abiogenesis is the natural process by which life is thought to have arisen from non living matter, such as simple chemical compounds. How life first…