They exist in the sense that the uncountable real numbers exist. The reals you can name are like your light cone. By symmetry it seems that the other reals/ spa

They exist in the sense that the uncountable real numbers exist. The reals you can name are like your light cone. By symmetry it seems that the other reals/ spacetime points should exist, but there's no way to prove they actually do if you're not already "nearby". :-)