You don't need absolute proof as an indicator that something exists. For example, in the 1600's it could not be proven that water was made up of several different specific elements. So, those elements do not exist? Or what?
Through the process of electrolysis it can be determined that the gas coming from the water is flammable, but also breatheable.... Deductive reasoning...There's probably oxygen in water. Still can't prove it though without some kind of specific analysis....
Not exactly the same deal with space, but similar. There's literally thousands of billions of stars in the universe. This cannot be disputed, this is known fact. There are even MORE planets in the universe than stars. It is known that there are other systems in the universe with planets at least resembling our own in shape and size.
It would be very naive to think that out of the thousands of billions of planets, no life could exist elsewhere. Even if you can't 'prove' that life is also out there somewhere, the numbers STRONGLY suggest that life IS somewhere out there. We exist. If we exist, someone else exists out there too. The universe is big enough that humans probably will never come into contact with a species from another starsystem or galaxy, but who knows.
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