These are rocky worlds with a mass between 5 and 17 times that of Earth. They are massive enough to retain a helium atmosphere.

These Helian worlds are in close orbits with their parent star.

These are massive worlds with hot, dense atmospheres which support super-condensed volatiles.

These worlds have deep oceans and thick atmospheres of water, hydrogen and oxygen. It is possible that they support life, though it will all be aquatic due to the lack of any land.