Since the dogma has no method for determining how many water worlds are
in the Milky Way galaxy, an estimate method and estimate is given using
the assumptions garnered by stellar metamorphosis theory.
Too long didn't read.
This means every galaxy that is similar to the Milky Way also has about that many water worlds. It is a big number. It is probably why microwave energy is coming from all over the galaxy. Its just water. They are literally just observing water worlds.