Class A
Geothermal
|
Age:
|
0-2 Billion years |
|
Diameter: |
1,000-10,000 km |
|
Location:
|
Ecosphere/Cold Zone |
|
Surface:
|
Partially molten |
|
Atmosphere:
|
Primarily hydrogen
compounds |
|
Evolution:
|
Cools to become Class-C |
|
Life-Forms:
|
None |
|
Example:
|
Gothos |
| |
|
Class B
Geomorteus
|
Age:
|
0-10 Billion years |
|
Diameter: |
1,000-10,000 km |
|
Location:
|
Hot Zone |
|
Surface:
|
Partially molten, high
surface temperature |
|
Atmosphere:
|
Extremely tenuous, few
chemically active gases |
|
Life-Forms:
|
None |
|
Example:
|
Mercury |
| |
|
Class C
Geoinactive
|
Age:
|
2-10 Billion years |
|
Diameter: |
1,000-10,000 km |
|
Location:
|
Ecosphere/Cold Zone |
|
Surface:
|
Low surface temperature |
|
Atmosphere:
|
Frozen |
|
Life-Forms:
|
None |
|
Example:
|
Pluto, Psi 2000 |
| |
|
Class D
Asteroid/Moon
|
Age:
|
2-10 Billion years |
|
Diameter: |
100-1,000 km |
|
Location:
|
Hot Zone/Ecosphere/Cold
Zone; found primarily in orbit around larger planets or in
asteroid fields. |
|
Surface:
|
Barren and cratered |
|
Atmosphere:
|
None or very tenuous |
|
Life-Forms:
|
None |
|
Example:
|
Moon (Sol IIIa), Lunar V (Bajor
VIIe) |
| |
|
Class E
Geoplastic
|
Age:
|
0-2 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Molten, high surface
temperatures |
|
Atmosphere:
|
Hydrogen compounds and
reactive gases |
|
Evolution:
|
Cools to become Class-F |
|
Life-Forms:
|
Carbon-cycle (Excalbian) |
|
Example:
|
Excalbia |
| |
|
Class F
Geometallic
|
Age:
|
1-3 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Volcanic eruptions due to
molten core |
|
Atmosphere:
|
Hydrogen compounds |
|
Evolution:
|
Cools to become Class-G |
|
Life-Forms:
|
Silicon-based (Horta) |
|
Example:
|
Janus IV |
| |
|
Class G
Geocrystalline
|
Age:
|
3-4 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Still crystallizing |
|
Atmosphere:
|
Carbon dioxide, some toxic
gases |
|
Evolution:
|
Cools to become Class-K,
L, M, N, O or P |
|
Life-Forms:
|
Primitive single-celled
organisms |
|
Example:
|
Delta Vega |
| |
|
Class H
Desert
|
Age:
|
4-10 Billion years |
|
Diameter: |
8,000-15,000 km |
|
Location:
|
Hot Zone/Ecosphere/Cold
Zone |
|
Surface:
|
Hot and arid, little or no
surface water |
|
Atmosphere:
|
May contain heavy gases
and metal vapors |
|
Life-Forms:
|
Drought- and
radiation-resistant plants, animal life |
|
Example:
|
Rigel XII, Tau Cygna V |
| |
|
Class I Gas
Supergiant
|
Age:
|
2-10 Billion years |
|
Diameter: |
140,000-10 million km |
|
Location:
|
Cold Zone |
|
Surface:
|
Tenuous, comprised of
gaseous hydrogen and hydrogen compounds; radiates heat |
|
Atmosphere:
|
Zones vary in temperature,
pressure and composition; water vapor may be present |
|
Life-Forms:
|
Unknown |
|
Example:
|
Q'tahL |
| |
|
Class J Gas
Giant
|
Age:
|
2-10 Billion years |
|
Diameter: |
50,000-140,000 km |
|
Location:
|
Cold Zone |
|
Surface:
|
Tenuous, comprised of
gaseous hydrogen and hydrogen compounds, radiates some heat |
|
Atmosphere:
|
Zones vary in temperature,
pressure and composition |
|
Life-Forms:
|
Hydrocarbon-based (Jovian) |
|
Example:
|
Jupiter, Saturn |
| |
|
Class K
Adaptable
|
Age:
|
4-10 Billion years |
|
Diameter: |
5,000-10,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Barren, little or no
surface water |
|
Atmosphere:
|
Thin, mostly carbon
dioxide |
|
Life-Forms:
|
Primitive single-celled
organisms, adaptable for humanoid colonization through the
use of pressure domes |
|
Example:
|
Mars, Mudd |
| |
|
Class L
Marginal
|
Age:
|
4-10 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Rocky and barren, little
surface water |
|
Atmosphere:
|
Oxygen/argon, high
concentration of carbon dioxide |
|
Life-Forms:
|
Limited to plant life,
suitable for humanoid colonization |
|
Example:
|
Indri VIII |
| |
|
Class M
Terrestrial
(Minshara Class)
|
Age:
|
3-10 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Surface water abundant; if
water or ice covers more than 80% of surface, planet is
considered Class-O or Class-P |
|
Atmosphere:
|
Nitrogen, oxygen, trace
elements |
|
Life-Forms:
|
Extensive vegetation,
animal life, humanoids |
|
Example:
|
Earth, Vulcan, Cardassia
Prime |
| |
|
Class N
Reducing
|
Age:
|
3-10 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
High surface temperature
due to greenhouse effect; water exists only as vapor |
|
Atmosphere:
|
Extremely dense, carbon
dioxide and sulfides |
|
Life-Forms:
|
Unknown |
|
Example:
|
Venus |
| |
|
Class O
Pelagic
|
Age:
|
3-10 Billion years |
|
Diameter: |
10,000-15,000 km |
|
Location:
|
Ecosphere |
|
Surface:
|
Water ice covers 80% or
more of surface area |
|
Atmosphere:
|
Nitrogen, oxygen, trace
elements |
|
Life-Forms:
|
Hardy vegetation, animal
life, humanoids |
|
Example:
|
Exo III |
| |
|
Class Q
Variable
|
Age:
|
2-10 Billion years |
|
Diameter: |
4,000-15,000 km |
|
Location:
|
Hot Zone/Ecosphere/Cold
Zone |
|
Surface:
|
Ranges from molten to
water and/or carbon dioxide ice, due to eccentric orbit or
variable output of star |
|
Atmosphere:
|
Ranges from tenuous to
very dense |
|
Example:
|
Genesis Planet |
| |
|
Class R
Rouge
|
Age:
|
2-10 Billion years |
|
Diameter: |
4,000-15,000 km |
|
Location:
|
Interstellar space,
cometary halos |
|
Surface:
|
May be temperate due to
geothermal venting |
|
Atmosphere:
|
Primarily volcanic
outgassing |
|
Life-Forms:
|
Non-photosynthetic plants,
animial life |
|
Example:
|
Dakala |
| |
|
Class S-T
Ultragiant
|
Age:
|
2-10 Billion years |
|
Diameter: |
10-50 million km (Class S)
50-120 million km (Class T) |
|
Location:
|
Cold Zone |
|
Surface:
|
Tenuous, composed of
gaseous hydrogen and hydrogen compounds; radiates
considerable heat |
|
Atmosphere:
|
Zones vary in temperature,
pressure and composition; water vapor may be present |
|
Life-Forms:
|
Unknown |
| |
|
Class Y
Demon
|
Age:
|
2-10 Billion years |
|
Diameter: |
10,000-50,000 km |
|
Location:
|
Hot Zone/Ecosphere/Cold
Zone |
|
Surface:
|
Temperature can exceed
500°K |
|
Atmosphere:
|
Turbulent, saturated with
toxic chemicals and thermionic radiation |
|
Life-Forms:
|
Mimetic (Delta Quadrant) |
| |
|
| |
Note: Classes X, Y and Z
are reserved for planets with environments particularly
hostile to humanoid life. |
|
