Well, it's naruto afterall, we all know that a fully recharge RSM naruto have a chakra capacity that is so massive like 10x the amount that sasuke's bijuu susanoo had. From kishi's theory which states that "anything which is a sphere or can be moulded to a sphere is rasenshurikenABLE". From that, one can believe an EARTH RASENSHURIKEN of SUN RASENSHURIKEN is possible and even if naruto can't throw them, he could still detonate them in as much as his wind chakra is rotating the body. Thus from the above one can safely say naruto is a galaxy buster.