https://www.youtube.com/watch?v=7HBKEDyFTv8&t=584s
I still have some problems with the concept of "spacetime". It seems to conflate two things that aren't the same. The problem with "spacetime" is that they sometimes make weird statements about extreme events, like saying that before the Big Bang there was no time, or that beneath the event horizon in a Black Hole that time flows toward the singularity. Scientists say that the Theory of Relativity breaks down in extreme events and is most certainly not a complete theory.
There is an alternate theory about Black Holes which states that they aren't infinitely dense. There could be a finite limit to density. There is also a much more fringe and probably not true theory that states that Black Holes are just super massive neutron stars.
If we accept that gravity can attract light then this explains gravitational lensing.
If we accept that there is a cosmic speed limit then this explains time dilation.
"Spacetime" is a model that explains both these things. When they say that space is curved, they really mean that spacetime is curved. This concept confused me for a long time.
In my mind, this doesn't rule out the possibility of another model. "All models are wrong. Some models are useful."
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