all boil in space because they’re all basically water. Both liquids and gases are made up of molecules that fly about at random, the difference is in the balance of kinetic energy and binding forces. In a liquid the binding forces win so it stays together, and in a gas the kinetic energy wins so it flies apart. This is why you can boil water. You add heat energy (heat is really just random kinetic energy), the balance is tipped toward kinetic energy, and the water flies apart.