>>83052608
Microbial aliens seem highly likely, especially with the recent discoveries on Mars. Unicellular lifeforms were the only ones present on Earth for like 3 billion years, so with two instances in the same solar system, I bet there are a shit ton of alien microbes out there.

But multicellular alien life? At this point I doubt it but who knows, we've still only scratched the surface exploring our own solar system and know next to nothing about any others.