The famous desert planet Arrakis is, according to recent computer simulations, a more likely type of planet to harbor life than Earth. In fact, “land worlds” (worlds with no oceans) have a habitable zone that is three times larger than that of Earth.
But an ocean planet with an atmosphere consisting primarily of hydrogen could change the game. By means of the greenhouse effect it can maintain a comfortable temperature even at the orbital distance of Saturn. Anyone for a tropical vacation to planet Hindenberg?