There’s even a famous song about it, from the movie Casablanca, and everyone knows the movie Casablanca.
We humans think that ‘time goes by’, time moves on, and space is where we park the car and hang our clothes. We see time and space as separate ‘things’. Always have.
Modern Physics suggests there is no such thing as Time and no such thing as Space separately like that, but only the-two-together as spacetime.
Can we really understand that without getting into other mysteries of maths and geometry? Perhaps, if we don’t make the same mistake twice.
Evidently we need to think of spacetime as not ‘inside’ or ‘outside’ something, but instead of Time-and-Space together as properties, or a property, of the Universe.
Now without getting technical (as if I would or could), Einstein is said to have got the idea for Special Relativity while going down in a lift somewhere.
Inside the lift, he intuited that if you were falling inside a lift that was falling, there would be no Space and Time anymore. Can we all imagine that happening? Just going on and on? Maybe we can, but not on Earth. Where then could such a thing happen?
Only where there is no up and down. left or right, no backwards and forwards. In spacetime infinite Universe. Where there is no Space and there is no Time.