We always heard the scientists say "the universe is expanding" and since there is "nothingness" other than the universe, where is the universe expanding?

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You're thinking too three dimensionally, which is understandable given that we only experience three dimensions directly, the problem can still be somewhat understood on an intuitive 3D scale though- here goes.

Imagine a balloon with nothing outside of it... Really nothing, not emptiness or space, just nothing. If we draw points on its surface then inflate the balloon the points will travel away from each other in equal measure. Everything outside the balloon is still nothing, and everything that exists is still balloon. If you shrank yourself down to stand on one of the dots the surface of the balloon would appear to be two dimensional, you would have no perception of the third dimension where the balloon is growing. Everything is 2D balloon, and appears to expand as the dots spread away from each other.

We are in 3D, we can't see any further dimensions, but those are the directions the universe expands... Not in, not around, but "through" our three dimensions. Everything is the universe, everything else is the universe, travel long enough in one direction and you end up where you started because there is no edge for us and anything that isn't Universe is simply nothing.

Level 7 Jan 20, 2018

We're expanding into nothing. When asked where it's going it says, "nowhere." When asked what it's doing it says, "nothing." Nothing's a lot of work. You can do nothing all day and still have tons of nothing left to do.

Level 8 Jan 20, 2018

The word universe has evolved to include multiverse. there can be a bigger picture we just don't see. we are limited to viewing just this universe for now.

Level 8 Jan 20, 2018

The thinking, as I understand it, is that space curves upon itself in a way that looks linear from a subjective perspective, so you could go straight forever and eventually arrive at your starting point. Space and time as we know it exist only within this growing bubble, so there's no edge to the universe, and no before (or after) the universe. That doesn't mean that other physics don't exist outside of our universe, but that we are confined to our universe and currently have no way to observe or measure outside of our bubble. What makes this concept so difficult is that we have nothing analogous to compare it to; we think of bubbles, balls, and balloons, but those objects aren't especially similar to this universal model. We lack an intuitive sense about how things work at very large and very small scales, so the idea of a confined infinity at the largest scales doesn't make intuitive sense to us any more than the idea of waveforms collapsing when measured at the smallest scales does.

Level 8 Jan 20, 2018

That’s an assumption that’s not necessarily correct. And just what constitutes nothingness?

Level 7 Jan 20, 2018

Think of the universe as an infinite plane of nothing.
Think of the big bang as everywhere on this infinite plane, "stuff" starts to appear.

Now, think of the infinite plane upon which nothing used to exist as a giant rubber sheet that is expanding, stretching form infinity to infinity +1.
Now, that "something" that is on top of the sheet will be carried along with the expansion and, voila, our universe is expanding.

So in the strictest sense, we aren't expanding into nothingness, we are expanding into somethingness and, given the infinite nature of the universe, there is always more somethingness for us to expand into.

Level 8 Jan 20, 2018

Correct.

"out there"

Level 4 Jan 20, 2018

I don't know but it is fun to think about

Level 9 Jan 20, 2018

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