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Rapid colonization of a space-returned Ryugu sample by terrestrial microorganisms
(onlinelibrary.wiley.com)
"We found aliens! Wait no, it's actually just us again..."
We should just bio-seed a planet just to see what happens. Like really ..what's the worst thing that could happen? (Genuinely asking)
Cause the way I see it, we could very well create a new planet or asteroid or moon with micro life on it. It would be nifty.
The worst that could happen in our lifetimes, I would say, is be a total waste of money and resources since no other reachable bodies have atmospheres suitable for Earth-based life. Beyond our lifetimes, and possibly beyond humanity's existence, that life may be able to survive somewhere but any kind of evolution likely takes millions of years and long-term survivability may not let it see that day