Aha, TFA, right :p Yeah, the faster-than-light topic is actually a very, very tricky one, even for seasoned astro-peeps it seems. I didn't mention PBS Spaceti

Aha, TFA, right :p Yeah, the faster-than-light topic is actually a very, very tricky one, even for seasoned astro-peeps it seems. I didn't mention PBS Spacetime[1] but it's probably the best place to start for best-in-class high level mojo in astrophysics. Tons of back-catalog. Really great quality production. Less 'newsy', more 'substance' than the other two I mentioned (these are my trio on the topic). Case in point: they do a fantastic job at explaining, notably time shenanigans. They basically made it click for me, notably for FTL (Faster-Than-Light) space expansion, cosmic inflation, etc. Fantastic-everything about them, can't recommend enough. One thing, though: my best way of framing the FTL limit is in terms of a speed limit (c) to transfer "information". This is why entanglement is a valid principle, it does not violate c because entanglement cannot be used to transfer information faster than light[2]. So "structure" can change arbitrarily fast, from the perception of its objects, its contents; but "information", the contents, the objects, they are bound by c and all the rules actually defined by said structure. I really don't know if that's the correct view, but it seems to work to explain (actually rule out) most light-speed paradoxes, so... [1]: https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g [2]: I think this vid does a good job at explaining why: https://youtu.be/2_4l5_G3dnM https://youtu.be/2_4l5_G3dnM