Actual or anticipated questions like
If the universe is expanding, then why aren't we, why no length has been observed to stretch, why no two things have been observed to move apart pushed by expansion, etc.
plague cosmologists so they have alleviated the problem by tweaking the theory. Our theory predicts expansion, cosmologists have decided, only for pure voids - so the annoying questions will become pointless. For spaces where stretching or moving apart
is observable and the annoying questions make sense, our theory predicts no expansion at all:
Sabine Hossenfelder: "The solution of general relativity that describes the expanding universe is a solution on average; it is good only on very large distances. But the solutions that describe galaxies are different - and just don't expand. It's not
that galaxies expand unnoticeably, they just don't. The full solution, then, is both stitched together: Expanding space between non-expanding galaxies...It is only somewhere beyond the scales of galaxy clusters that expansion takes over."
https://www.
forbes.com/sites/startswithabang/2017/07/28/most-things-dont-actually-expand-in-an-expanding-universe/
"Space DOES NOT Expand Everywhere...Is the space inside, say, a galaxy growing but overcome by the gravitational attraction between the stars? The answer is no. Space within any gravitationally bound system is unaffected by the surrounding expansion."
https://youtu.be/bUHZ2k9DYHY?t=356
Pentcho Valev
https://twitter.com/pentcho_valev
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