Planet Classification System

Terrestrial

A - Aklan = Earth-like but toxic atmosphere; suitable for life only with atmospheric domes
E - Eldria = Earth-like, oxygen - nitrogen based atmosphere; suitable for life
X - Xebal = Barren planetoid; no atmosphere

Gas Giants

J - Juna = Gas Giant; non-toxic atmosphere
H - Hechath = Gas Giant; toxic and corrosive atmosphere

Extreme Worlds

U - Ugal = Water World; 90% of the planet's surface is covered in ocean
Y - Yrandi = Sulfuric Atmosphere or Geologically volatile