Physics, Astronomy & Cosmology / Re: If the universe as we know it is expanding ? what exactly is it expanding into?« on: 22/05/2017 01:12:26 »
As far as we can tell, it's not expanding into anything, it's simply expanding. It is technically possible that the Universe is expanding into a higher-dimensional "hyperspace", but it's not a necessary requirement. Just think of it as the amount of space in the Universe increasing over time.
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