No, there is no such point. Oh, how I tormented my parents with this question in the distant childhood pre-Internet era)
Here about the ball:
What is the expansion of the universe and how did you manage to find out about this phenomenon?
Our entire Universe is that initial "point".
Yes, there is such a theory.
According to this theory, a Big Bang occurs and the universe expands in all directions, stars and other cosmic bodies are formed. As the universe expands, it cools down and over time begins to shrink until it shrinks to a point where there will be an unimaginably colossal temperature and pressure, an explosion will occur and all over again.
It seems to be possible to calculate this, but I don't know how, you need search for information on the Internet.