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
I think the main response I would have to this is, why does there have to be an “into”?
Honestly even posing that as a requirement brings about a whole shitload of logical issues, because there would always need to be a larger container.
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