I guess it depends on what you consider to be the universe. As you may have heard the universe was supposedly created from a big bang, and is thus expanding. You cant expand if you're infinite. Astronomers have seen pretty far out, nearly to the edge of this expansion but can never see the edge due to its properties (lack of light for visibility).
The universe is expanding.. so that means it is probable that it is expanding into something. What it is expanding into and how far that something extends, no one knows. And is what the universe is expanding into also considered the universe? or is it something else?
If you really want your mind blown you should look into the theories that the universe is a giant hologram. Part of that theory suggests that every part of the universe is contained within every part of the universe. So for example inside a strand of hair is an infinite number of universes.. all of those universes being THIS universe.
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We Must Dissent.
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