Our Universe is believed to be all of space, including everything we know such as galaxies, stars and planets. Some scientists think there may more more than one universe but it’s only a theory and we may never know if other universes exist, yet alone get to them
Even if other universes did exist (and there’s recently been more evidence that they might, because of something called inflation) it would probably be impossible to reach them. In theory, something called a wormhole could offer a shortcut. But there’s a famous proof that wormholes big enough to cross can never exist, so that’s out too!
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