[Hot Tabasco]

I tend to view space/universe, as nothingness with galaxies floating around in it.

If it's expanding, what is it expanding into?

If it's not expanding, what lies beyond the furthest edge? Is there just a big wall, and the universe is just contained in a big box?

I doubt we will ever know....

[1Old Pro]

I tend to view space/universe, as nothingness with galaxies floating around in it. If it's expanding, what is it expanding into? If it's not expanding, what lies beyond the furthest edge? Is there just a big wall, and the universe is just contained in a big box?

Yep, very confusing. Is the universe flat? Could we fall over the edge?

[Boogieman]

“If it’s expanding, what is it expanding into?”

Nothing, apparently.

Imagine you have a spreadsheet. That spreadsheet has 10 rows and 10 columns. From your perspective, working in Excel or whatever, there is nothing (no data) outside of the spreadsheet. If you add more rows and columns (or just increase the width of the existing ones) now you have a bigger spreadsheet. But what did it expand into? From the perspective of the user, it expanded into nothing.

Now from the programmer’s perspective, he may know that the spreadsheet is now using more resources that exist on a storage device. But the user can’t see that. Science is like the user that can never peek outside of the program and see what is happening outside of it. There may be something there, but we can’t detect it.