| 1 |
Class A |
Geothermal - partially molten |
Primarily hydrogen compounds |
| 2 |
Class C |
Geoinactive - low surface temperature |
Frozen |
| 3 |
Class D |
Asteroid/Moon - barren, cratered |
None |
| 5 |
Class F |
Geometallic - volcanic eruptions |
Hydrogen compounds |
| 6 |
Class G |
Geocrystalline - still crystalising |
Carbon dioxide and toxic gases |
| 7 |
Class H |
Desert - hot and cold, little or no surface water |
May contain heavy and toxic gases |
| 8 |
Class I |
Gas Supergiant - tenuous surface, hydrogen gases and compounds, radiates heat |
Variable temperature and pressure, water vapour may be present |
| 10 |
Class K |
Adaptable - barren, little or no surface water |
Mostly carbon dioxide |
| 11 |
Class L |
Marginal - rocky, barren |
Oxygen, argon and high concentration of carbon dioxide |
| 12 |
Class M |
Terrestial - abundant surface water, with polar ice caps |
Nitrogen, oxygen and trace carbon dioxide |
| 13 |
Class N |
Reducing - high surface temperature |
Carbon dioxide and sulfides |
| 14 |
Class O |
Pelagic - liquid water covers over 90% of surface |
Nitrogen, oxygen and trace elements |
| 15 |
Class P |
Glaciated - water ice covers over 80% of surface |
Nitrogen, oxygen and trace elements |
| 16 |
Class Q |
Variable - range of ice to water to molten |
Ranges from tenuous to very dense |
| 17 |
Class R |
Rogue - maybe temperate due to geothermal venting |
Primarily sulphur |
| 18 |
Class S-T |
Ultragiant - tenuous surface, hydrogen gases, very strong gravity |
Gaseous and liquid hydrogen |
| 19 |
Class Y |
Demon - surface temperature exceeds 500^o^K |
Saturated with toxic chemicals and thermionic radiation |
| 20 |
Unknown |
Unknown |
Unknown |