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.
Your argument has shifted from “We are the only life in our universe” to “There may be 2-3 other planets with life, but we’re probably the only one in the observable universe”, so that’s progress.
I don’t think anyone’s arguing that life is common, but even just the observable universe is estimated to have around 200 sextillion planets in it, so it can be an immensely minuscule probability and still have multiple occurrences. You sort of address this in the OP but call on Occam’s Razor as the explanation; that isn’t really backed up at all by any scientific principle that I’m aware of. Occam’s Razor isn’t intended to explain things like the structure of the universe, and applying it here isn’t using it correctly. And unless I misunderstand it, the application of the anthropic principle here explains why the universe we observe has the properties necessary to support life (because if it didn’t, we wouldn’t be here to observe it); that in no way suggests that we’re the only life potentially observing it. In fact, I’d interpret it the opposite way: This universe has demonstrated that it has properties that can support the creation of life, so there’s probably multiple instances of life in it. There may be other universes where life is impossible, but it is demonstrably possible in this one.
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.