Actually, the parts of the universe receding from us faster than the speed of light can still be causally connected to us. It’s a known “paradox” that has the following analogy: an ant walks on an elastic band toward us at speed c, and we stretch the band away from us by pulling on the far end at a speed s > c. Initially the ant despite walking in our direction gets farther, but eventually it does reach us (in exponential time). The same is true for light coming from objects that were receding from us at a speed greater than c when they emitted it. See https://en.m.wikipedia.org/wiki/Ant_on_a_rubber_rope
Yes it does, look at the caption of Fig. 1:
"Photons we receive that were emitted by objects beyond the Hubble sphere were initially receding from us (outward sloping lightcone at t <∼ 5 Gyr). Only when they passed from the region of superluminal recession vrec > c (gray crosshatching) to the region of subluminal recession (no shading) can the photons approach us".
I can’t reply to your last reply. I agree, in fact I said those regions can be still causally connected to us, not that they are.
It shows that SOME “superluminal” photons can reach us, not that ALL can. With accelerating expansion, eventually all galaxies fall out of that interval and become unreachable.
