Maybe.
It's a simple answer, the fact of the matter is that no one knows if this is the only universe. Though without any way to confirm the existence or absence of other universes, I just work under the assumption that there aren't any.
Let me ask you a question: Why do you only feel powerless when finding out that there is more than one universe, despite standing on a tiny blue ball orbiting one of the 300,000,000,000 stars in out galaxy, in only one of the 100,000,000,000 galaxies in the known universe?
I will give you an explanation: 1 universe means it doesn't matter how complex it is but we'll still study and fully understand it one day.
Introducing a whole lot more universes with the mathematically impossibility of traveling in-between means science = 0. What is the point of it? you're studying 1 bubble in an infinite more bubbles with infinite more possibilities that may be in 1 gigantic bubble that is it self part of more infinite bubbles, shits gets real when you see that this theory suggests imploding black holes creates even more universes within theses ones which them selves grow infinite in size because they're not bound by our spacetime
Then I was like
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