These are the types of worlds so far observed:

ROASTERS: gas planets in close orbits detected by rhythmic starlight shift but not directly seen, so their mass and orbit can be deduced but not their dimensions.

TRANSITTERS: roasters which pass in front of their star so that their dimensions can be seen more clearly.

ROCK WORLD ‘SUPER EARTHS’: smaller planets detected by both of the above means whose mass and dimensions suggest that they may be made of rock. But most are many times larger than this Earth.