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.
Yeah, clearly there are no scientific evidence, that’s why I post it really as an opinion.
What I understood from anthropic principle and other sources is, either our universe has been fine tunes, either it is one among billions of other universe.
If some “god” fine tuned the universe for life, he would have not over design it, and would have created the simplest universe where life can live. Well, that’s what I would have done 😅
If our universe is just the one over billions where physical constant are compatible with life, statistically, simpler univers would appear first. The more complex the universe is, the more complex it is to makes it compatible for life. It life can appears in a universe with only 3 constant and one galaxy, I think we would live in this universe instead of ours.