We are the only life form of the univers. Not even the only intelligent, but the only one. My arguments are:
Life is absolutely everywhere on earth. There is not a single isolated island or deep trench in the ocean that is not covered by life. If life can live elsewhere, univers would be covered by life. Some bacteria would have been ejected into space by some cataclysme and had colinized nearby planets. Kind of Fermi’s paradoxes.
Antropic argument. Our universe is suitable for life because if it weren’t, we simply wouldn’t be there. Add it to Okam razor. If a smaller, simpler, universe could handle life, we would be in that one. Not our current one.
“Our universe is so huge, so there must be other life form” is not the right statement. Our universe is so huge because it is the smallest universe where life could potentially appear.
Only my opinion, not a scientific demonstration.
Universe is sparse, but panspermia is a valid theory, right ? I admit I just briefly read the wiki page about it, I didn’t dig to check if it is a valid theory or not.
Regarding anthropic principle, I thought that weak one was about time and space in universe (earth around the sun and not another planet) and strong one was about the whole physic (our universe with its physical constants). Am I missing something ?
I’m clueless on what you’re thinking about with your ideas on the principle. I can’t think of a way to make either of those apply, but I could be missing something, super possible.
I don’t entirely disagree with OPs base opinion, just how we get there. Just important to remember how early in the game we really are and how big the playing field is. Panspermia is interesting, but I personally think it mostly increases complexity instead of reducing it. I’m super skeptical of the idea of it being common.