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Fermi Paradox
The fermi paradox is the question of "Where are all the aliens?" -
Seti is Created
Seti is now a pretty big non for profit alien research institution but this where it started. https://www.seti.org/ -
Discovery of Exoplanets
Exoplanets are where we think aliens are the best chance of being found. -
Europa Life Potential
Europa is a moon of Jupiter with a subsurface ocean beneath ice. -
Titan Life Potential
A moon of Saturn with stable, surface liquid methane and ethane lakes -
Enceladus Life Potential
Enceladus is a moon of Saturn with a subsurface ocean beneath ice. -
Oumuamua
Most likely a natural object this "asteroid" due to its bazar shape and trajectory there is speculation as to whether it is an alien artifact.