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The fermi paradox is the question of "Where are all the aliens?"
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Seti is now a pretty big non for profit alien research institution but this where it started. https://www.seti.org/
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Exoplanets are where we think aliens are the best chance of being found.
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Europa is a moon of Jupiter with a subsurface ocean beneath ice.
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A moon of Saturn with stable, surface liquid methane and ethane lakes
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Enceladus is a moon of Saturn with a subsurface ocean beneath ice.
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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.