No, it’s not space itself. Relative to what would it expand? It’s galaxies moving away from one another, which necessarily increases the space between them. Se

No, it’s not space itself. Relative to what would it expand? It’s galaxies moving away from one another, which necessarily increases the space between them. See also: https://en.wikipedia.org/wiki/Expansion_of_the_universe#Expansion_of_space https://en.wikipedia.org/wiki/Expansion_of_the_universe#Expa...