[quote]They are nothing but gas and have no solid ground.[/quote] uhhhh, what? Gas Giants have solid rocky cores, they are relatively small compared to the large balls of gas surrounding them, but you cannot fly through the center of a Gas Giant and come out on the other side, they do have solid ground, there is just too much pressure to be able to go there. Saturn and Jupiter have a large number of satellites though. And I am not sure why other people are saying you could go to the moon. He is asking about the Gas Giants in our solar system, the moon orbits Earth.