I absolutely believe that if there are other alien lifeforms out there. Considering how massive and infinite the universe is, there have to be species both on the cellular level and species in the same boat as us (not ready for travel to other clusters or galaxies), and those so advanced that it's incomprehensible.
The ones that are so advanced either haven't found us, or see the world we live in and don't want to bother with our bullshit
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