Those are questions definitely to consider.
I actually had a conversation with
@John K last week regarding the existence of aliens, debating whether if they had the probabilities of being either hostile or friendly, and our level of connection with them as human beings.
My views still stand, I am hopeful that they exist, but I am unsure of their nature. It’s a gamble for sure. Hence why I believe we need to be kinder to one another despite the unknown out there.
The probability of another planet with humans could be likely, but very rare. Their planet would have to be a good hotspot for life and the initial factors that caused life (good position away/near the sun, tilt, internal heat, heavy bombardment, etc, etc). And for other humans to exist, they would've also gone through similar evolutionary processes and conditions as we did.
It’s a lot of factors to consider of the probability of other human existence on other planets. Could there be a chance that other humans exist though? Absolutely, the universe is way too vast and incomprehensibly huge, but it’s probably rare.
The time and space question, that’s something I still wonder myself though.