The Drake Equation
The Drake equation is a famous formula that estimates how many communicating alien civilizations might exist in our galaxy. It is less a precise…
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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.…
Planet Nine
Planet Nine is a hypothetical large planet proposed to exist in the far outer reaches of our Solar System, well beyond Neptune and Pluto. It has…
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…
The Dyson Sphere
A Dyson sphere is a hypothetical megastructure that an extremely advanced civilization might build around a star to capture a large share of its…
Wormholes
A wormhole is a hypothetical tunnel through spacetime that could, in principle, connect two distant points in the universe, or even two different…