Planet size

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Planets in Master of Orion can have six different sizes, though one is reserved to gas giants. Along with biome, mineral richness, gravity, and resources, size is one of the parameters defining a planet.

General information[edit | edit source]

Type Image Colonizable Max Cells Moon Chance Terraforming Cost Factor Pollution Capacity Pollution Absorption Factor
Tiny
Planet terran.png
Yes 8 25% 35% 250 60%
Small
Planet terran.png
Yes 12 25% 50% 275 80%
Medium
Planet terran.png
Yes 16 33% 100% 300 100%
Large
Planet terran.png
Yes 20 33% 130% 325 120%
Huge
Planet terran.png
Yes 24 50% 170% 350 140%
Gas Giant
Planet gas giant.png
No 0 0% 100% 0 0
Colonizable
Whether colony ship can land on this planet.
Max Cells
How much population this planet size can shelter. The actual value also depends on the biome: half is multiplied by the farmable cell factor, half by the productive cell factor, so the maximum size can only be reached on Gaia, tropical, grassland, and cavernous planets. (Note that aquatic species such as the Trilarians consider terran and ocean planets to be Gaia-class.) The maximum population can also be increased by advanced city planning and patched biospheres.
Moon Chance
Probability of a planet this size to be generated with at least one moon.
Terraforming Cost Factor
Modifier to the production cost of terraformation projects, including terraforming but also gaia transformation and all uber transformations.
Pollution Capacity
How much pollution must be accumulated before the planet's biome degrades.
Pollution Absorption Factor
A modifier to the planet biome's absorption factor. This requires the Unofficial Code Patch.

Population Growth[edit | edit source]

Population growth depends on planet size. A smaller planet will reach its population cap faster than a larger one, not just because said population cap is lower, but also because population growth will be faster, all else being equal.

Type Image Minimum Required Maximum Required Start Maximem Required End
Tiny
Planet terran.png
75 80 170
Small
Planet terran.png
75 100 200
Medium
Planet terran.png
75 125 250
Large
Planet terran.png
75 150 300
Huge
Planet terran.png
75 180 350
Minimum Required
How many life points are required at a minimum for the population to grow.
Maximum Required Start
How many life points are required at a maximum while the planet's current population is less than half its population cap.
Maximum Required End
How many life points are required at a maximum once the planet's population has reached over half its population cap.

Moons[edit | edit source]

Larger planets are more likely to have moons. Having at least a moon allows to build the moon laboratory and the orbital shipyard on the planet, however there are no gameplay advantages to having two moons instead of just one, or to having larger moons instead of smaller ones.

Type Image Moon Orbits Small Moon Medium Moon Large Moon
Tiny
Planet terran.png
1 100% 0% 0%
Small
Planet terran.png
1 100% 0% 0%
Medium
Planet terran.png
1 70% 30% 0%
Large
Planet terran.png
2 50% 30% 20%
Huge
Planet terran.png
2 20% 30% 50%