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of course the universe is endless, if it wasnt what would you expect would be on the outside hmm? its impossible that anything can exist outside the boundaries of the universe because there is no boundaries.
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okay, think about it. if the universe would be endless, there would be an endless amount of galaxies and stars. if so, the space would be white, cause every direction you would look into space should be filled with a star or galaxy or anything, but it isn't. space is black filled with a huge, but not endless amount of glowing material. it's called the Olbers' Paradox. there are other reasons too, why the sky isn't white, but the current idea of physicists about space is, it's finite as there is a finite amount of space, filled with a finite number of stars, each with a finite life-span.