Adaptive Spire
Barren Planets
Volcanic Planets
Gas Planets
Desert Planets
Icy Planets
Toxic Planets
Gas Planets
Metallic
Oceanic
+2 artifact bonus
Terra
Exotic planets
Dyson Planets
Aphotic Planets (AKA 'Shadow' planets)
Ecumenopolis Planets
Crystal Planets
Irradiated Planets
Demon Planets (AKA Class Y planets)
Plasma planets
Gaia planets
+2 artifact bonus
Sentient planets
Dyson Planets