Imagine you have a box that contains the whole universe, and you are looking into it. Space expanding would be like zooming out, but the edges dont move. It still occupies the same box, but now there is more stuff inside of it. I'm sure someone can come along and explain how this doesn't work mathematically, but it's the only way I could try to comprehend it.
Moist_Comb t1_jed8dkh wrote
Reply to comment by ForestCityWRX in ELi5 If the universe is expanding, what is it expanding into? by cashmoneyhash
My interpretation of expanding space is:
Imagine you have a box that contains the whole universe, and you are looking into it. Space expanding would be like zooming out, but the edges dont move. It still occupies the same box, but now there is more stuff inside of it. I'm sure someone can come along and explain how this doesn't work mathematically, but it's the only way I could try to comprehend it.