Can there exist a planet... with a moon... with a moon? In theory a moon could hold it's own moon within it's gravity You figure that if there is a sun, and it's gravity allows planets to hold moons, a planet (Acting as a sun) would would be able to have a moon (Acting as a planet) with it's own satellite (Acting as the Moon). Of course I could be incorrect as I only have about a Full 8th Grade education of Astronomy and Mathematics with bits and pieces of 9th grade. Please do correct me if I am wrong in my thinking.