It depends on what kind of alien and environment they're from. Personally I think aliens are like the animals on earth just more adapted to that planets environment. So maybe there's a whale that's more adapted to the environment of a moon on Jupiter
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I’d just be excited because it would mean life is way more common than we think it is and it sharpens the Fermi paradox.
We won’t know what they look like for a long time after we can detect them tho since they’re under ice