If the space somewhere ends, there is nothing beyond that ?! We can’t imagine that.
If the space nowhere ends, how large is the space ?! We can’t imagine that either.
And the opposite:
The space is composed of points.
If a point is finitely small, there are nothing smaller than that ?! We can’t imagine that.
If a point is infinitely small, we can’t imagine that either.
We can’t understand our ordinary space.
If the stars go away from the Earth, that may not signify at all that our known Universe began with Big Bang.
Our known Universe is only a point in reference with whole Universe. So, even if we accept that our known Universe began with Big Bang, that not signify at all that whole Universe began with Big Bang.
In such case, the Big Bang (“Big” Bang) is only a Micro Bang.