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.
Regarding current values of physics constant (speed of light, G, mass of electron, etc…) It’s statistically not possible that our universe just appears like this. Either it has been fine tuned by some “god” to make life possible, either there are billions and billions other universe with differents constants but where life is not possible (see https://en.wikipedia.org/wiki/Anthropic_principle)
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. If our universe is just the one over billions where physical constant are compatible with life, statistically, simpler univers would appear first.
Well, I think so. My argument can be summarized as: things happen in the simplest system that can handle them.
Assuming the universe was intentionally created, I don’t think it follows that making a home for humans must have been the creator’s only goal, if it was even a goal in the first place. we could just be a side effect and the main event, whatever it is, is happening well outside the sphere of the universe that we can observe. Or maybe the universe is a desk toy that’s fun to look at for a while before it hits maximal entropy and is discarded, and life as we know it is just a neat accident that happens sometimes. Maybe such universes are engineered to be teeming with life, and ours (or our region) is just sparse.
Also not sure why simple things can’t occur in complicated systems. seems like humans would be able to exist in any universe above a certain threshold, but if the universe were a trillion times larger and more complicated than it is, we could more or less get by, at least for a while. And depending on the timescale you’re talking about, I don’t think there’s strong reason to believe this universe is compatible with life. Life may well disappear as the stars burn out and entropy increases, and whatever set the universe in motion may never care or even notice. Maybe creating universes like ours and allowing them to cure to a maximal entropy is how they make their version of coffee filters.