>>24860163The distance between two points in space cannot be measured. The space between the points of measurement is expanding with the Universe. All the distances we measure are relative to points we perceive as being fixed. Gravity creates the illusion expansion isn't happening on interstellar scales of distance by pulling on things harder than space can push them apart. However, objects with great distance between them cannot fight the force of expansion. The light from galaxies beyond our own is redshifted by the expansion of the very space it was forced to spend billions of years traveling through.
Unrelated to this, I made this just now. I pray it is useful to someone.