Let's think that this whole outer space is a round shape and black colour/dark. So no matter how we explore, we won't know we already explored the place and we think that it's a new place. No to mention about new planets or galaxies are newly formed at the same time. So it's impossible to say how big is the universe. I do believe there are aliens since this universe is big. We live in Milky Way galaxy right? So there might be other galaxies other than our Milky Way. Maybe a time portal or time travel can help us go to other galaxies or planets
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