So, this bit of information confused me lately. Before, I figured galaxies were no longer visible by us because their luminosity decreased in an inverse square manner. However, while watching a movie I stumbled upon the concept of how galaxies disappeared from our sight because the space which both galaxies occupy is moving away from each other faster than the speed of light.
I understand nothing can move faster than the speed of light, but the argument here, I guess, is that space itself can move, as a consequence of the Big Bang, faster than the speed of light. Is this correct? If not, how do galaxies disappear?