Galaxia doesn't really die. Sailor Moon manages to get chaos to leave her body and then she leaves earth to guide all the star seeds back to their original planets.
Well... The series sort of ends after the battle with Sailor Galaxia. But we do get a hint that the world goes into a deep sleep sometime in the future, and Neo-Queen Serenity awakens it with the...
It is implied that there is a guardian for every single major celestial body in the universe. The number of Senshi is the same as this number, which is unknown by any human. But in the show, they...