The Earth, planets, the Sun and the stars may all be like soap bubbles, empty inside, and be held together with electrical charge keeping them all round and preventing them hitting each other (same charges repel each other). If they are empty what's on the other side of the Earth's crust? Am I on the outside? How does perspective lie? Star Trek "The Earth is hollow and I have touched the sky." Come on guys, when you are on the move again, I want to hitch a ride and see myself.