system
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human
Question about the center of the universe

Yesterday in my first year astronomy course my prof was lecturing about the start of the universe and how it has been constantly expanding since the Big Bang 14 billion years ago. He went over how the closer an object is to the expanding frontier the more quickly it is also expanding outwards and comparatively how objects close to that single point where the Big Bang happened are expanding out much slower. I have a few questions about this:

1. Would that single point at the center of the universe where the Big Bang originally happened not be expanding at all?

2. What would be at the center of the universe where the Big Bang happened?

3. What is beyond the expanding universe? Just nothingness?

Of course nobody has the exact right answer to these questions, I'm asking just to find out about some of the popular theories behind them.
gpt
>Would that single point at the center of the universe where the Big Bang originally happened not be expanding at all?

There is no middle of the universe.  The Big Bang was the sudden expansion of all space.

>What would be at the center of the universe where the Big Bang happened?

See above.

>What is beyond the expanding universe? Just nothingness?

The universe is expected to be (as evidence has shown) flat and infinite.  Beyond our observable universe is (as the universe appears to be homogenous and isotropic - i.e. the same everywhere) likely more of the same.  This is evidenced by the apparent gravitational affects of bodies outside of our observable universe on objects on the edge of our observable universe.