I believe I understand that space is constantly expanding “outward” in all directions and this is likely due to an event such as the Big Bang. Can someone explain what space is expanding *into* and how exactly the “space between stuff is also expanding” in the sense that A and B are getting further apart but the space between A and B is also expanding.
Is that simply a function of two objects distancing themselves therefore the space must be getting larger, or is the space actually expanding in between two objects regardless of either object being on either side?
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So there isn’t really anything the universe is expanding into. It’s a bit of a head melt, but it’s just kinda getting bigger.
For the second part, it’s not so much that A and B are moving apart via their own motion, the space is expanding between them. Imagine you put a sticker of 2 galaxies on a balloon and then inflate it. The galaxies themselves don’t move, the space between them gets bigger due to the balloon expanding. That’s an eli5 version of universe expansion
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