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.
Actually, life won’t be possible anymore in some billions of years. Not enough stars anymore, too much spaces between galaxies. Too Much darkness 😢
We are in the very brief bright moment of the universe.
Life as we know it, life in different forms may thrive.
They have already had billions of years. They may have already been started just very far away.
Life on earth isn’t dependent on any other star, none of what you mentioned is relevant to life arising on earth.
Life did depend on other stars. At the very beginning, there were only hydrogen in space. Then 1st generation of stars built helium by fusion then explode, creating second generation of stars that create heavier elements and so one.
Life really couldn’t appears in a single star universe, because there were just not enough “atomes factories”.
OK, now the matter is here, other stars might not be required anymore. But stars have a very limited life time. Sun will explode in ~5 billions years, so do other stars. Other stars will born, but this is not unlimited. Once every atoms will be fusion into heavy elements, there just won’t be new stars anymore and univers will enter in its dark era. This should happen in ~100 billions years. Then there will just be blackhole during 10e100 years, and then very slow decay during something like 10e(10e(10e10)) years. At least, it is one of the currently admitted theories.
Yes, my point is as long as there’s new stars that’s all you need, it doesn’t matter if they’re rare or far apart, unlike what you stated.