Basically the title – I have a degree in Aerospace Engineering, but I still can’t answer this question posed by my girlfriend. An infinitely expanding universe implies that there’s a “container” the universe is expanding into, kind of like how you can pour a pancake into a pan & it’ll expand to the limits of the pan. But then that also implies that said container existed before the universe / big bang, which is…wild. Anyway, please ELI5!
In: Physics
You’re inside a balloon, you’ve nevern been outside of it you don’t know there is an outside.
Someone begins to blow the balloon up by pumping air in it. Your known universe has expanded
There are some legitimate theories that our universe is one of many in a multiverse. So it could be expanding into the multiversal space. But we don’t have any way of testing that hypothesis.
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