It’s said that the universe goes on forever but how do we know?
In: Earth Science
They don’t know that, and don’t claim to. All we know about is the *observable universe* – the distance around us that light has had time to reach us from, since about the start of the universe. Anything outside of the *observable universe* is simply too far away for light to have reached us, even in ~14 billion years.
Beyond that distance, astronomers make no claim about what exists – i’m sure people have their own guesses, but there’s just no data that could be taken about it, even hypothetically.
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