In our solar system we have rocky moons, ocean moons and frozen-ice moons, but there are no gas moons. Are we just unlucky not to have any gas moons, or are there physical reasons why they cannot exist?
Space
In our solar system we have rocky moons, ocean moons and frozen-ice moons, but there are no gas moons. Are we just unlucky not to have any gas moons, or are there physical reasons why they cannot exist?
Space