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There are three main categories of planets: Terrestrial planets, Water Worlds. and Gas Giants.

The term planet refers to celestial bodies orbiting a star with a gravity in a specific range. The gravity of a planet has to be strong enough to hold fluids in a stable state (hydrostatic equilibrium) which prevents them from escaping the planet, and low enough to prevent nuclear processes to start as in stars.

Some astronomical objects that meet the official criteria for planet status yet also happen to orbit a planet are instead classified as natural satellites or moons. When a moon's orbit expands to the point that the barycentre of the planet-moon system falls outside the center of the planet, then both bodies would be considered planets and part of a double-planet system.[1]

Terrestrial Planets

Image Class Colour Rarity In game description
Icy Body Atmospheric: White.

Airless:

Blue, orange, green, yellow, pink (Rare).

Very Common, especially when orbiting cooler M class stars and brown dwarf stars including classes L, T, and Y. Ice world composed mainly of water ice. Worlds like this will not have had much heating in the past, forming in the cooler regions of a star system, and have retained many volatiles as solids within their crust.
Rocky Body Atmospheric:

Yellow, black, brown.

Airless:

Orange, grey, brown, red, green, black.

Common Rocky world with little or no surface metal content. Worlds like this have lost most of their volatiles due to past heating, and any metallic content will form a small central core.
Rocky Ice World White - Grey - Light blue - Light brown  Uncommon Rocky ice world. Typically formed in the cooler regions of star system these worlds have a small metal core and thick rocky mantle with a crust of very deep ice. Geological activity is common in these worlds because of the large quantities of volatiles in the crust, often creating a thin, sometimes seasonal atmosphere.
High-Metal Content World Atmospheric:

Yellow, black, brown.

Airless:

Orange, grey, brown, red, green, black.

Common (Rare if orbiting M, L, T, S class stars) High metal content world with a metallic core. Worlds like this can have metallic ores near the surface in places, especially around areas of past volcanism.
Metal-Rich Body Atmospheric: Black, brown, visible lava.

Airless:

Typically deep red/orange due to proximity to star.

Rare, can be found in close orbit around G, F and A class stars. Metal-rich worlds like this have a large metallic core, with plentiful metallic ores even at the surface. In places, especially around areas of past or current volcanism or liquid erosion, some higher metals can be found in their elemental form too. Mining is therefore very efficient, so these worlds are highly valued.

This type of planetoid is always within close proximity of a star, often taking the form of a lava-covered planet or a potato planet.

Earth-Like World Blue with green, brown and white

Extremely Rare (Mainly orbit K, G, F class stars)

Said to be less common in the galactic core.

Outdoor world with a human-breathable atmosphere and indigenous life. The atmosphere is far from chemical equilibrium as a result.
Ammonia World Atmospheric:

Light brown, brown, beige.

Airless:

Brown.

Very Rare Terrestrial ammonia world with an active ammonia-based chemistry and carbon-ammonia based life.
Non-spherical Bodies Atmospheric:

N/A

Airless:

Grey.

Rare (Commonly found orbiting M Class stars) These are planets or moons with a nonspherical shape, with a radius of less than 1 000 KM. It's elongated and can resemble a potato. Typically do not retain any atmosphere.

Take caution when travelling near nonspherical bodies, as their small size can cause one to believe they are travelling further from the body's orbital cruise zone than they actually are and subsequently colliding at a significant velocity with the celestial body's glide engagement zone, triggering an emergency drop from supercruise and causing starship damage.

Terraformed World Blue with green, brown and white

Accounts for most Earth-Like Worlds in inhabited areas of space. Cannot be found in deep space

Outdoor world with a human-breathable atmosphere and indigenous life. The atmosphere is far from chemical equilibrium as a result.


Water Worlds

Image Class Colour Rarity In game description
  • Water World
  • THAILOAE EM-M D7-2 A 6
Water World Atmospheric

Blue, often with white (ice).

Airless:

Blue.

Rare (More common if orbiting K, G, F and A class stars) Terrestrial water world with an active water-based chemistry and carbon-water-based life.

Water Worlds may occasionally possess a small cluster of islands. This does not alter its classification, however.

Gas Giants

Image Class Rarity  In game description
I Uncommon Class I or Jovian gas giants have primarily hydrogen and helium atmospheres. Colouration comes from clouds in the upper atmosphere of ammonia, water vapour, hydrogen sulphide, phosphine and sulphur. The temperature at the top of their upper cloud layers is typically less than 150 K.
II Rare Class II gas giants have primarily hydrogen and helium atmospheres. Water vapour in the upper cloud layers gives them a much higher albedo. Their surface temperature is typically up to or around 250 K.
  • Type III Green Gas Giant
III Uncommon Class III gas giants have primarily hydrogen and helium atmospheres without distinctive cloud layers. Their surface temperature typically ranges between 350 K and 800 K. They are primarily blue in colour because of optical scattering in the atmosphere - with the chance of wispy cloud layers from sulphides and chlorides.
IV Very Uncommon Class IV gas giants have primarily hydrogen and helium atmospheres with carbon monoxide and upper clouds of alkali metals above lower cloud layers of silicates and iron compounds, hence he brighter colours. The temperature of their upper cloud layers is typically above 900 K.
V Very Rare Class V gas giants have primarily hydrogen and helium atmospheres, with thick clouds of silicates and iron compounds, even metallic iron.They are the hottest type of gas giants with temperatures at their upper cloud decks above 1400 K, and much hotter in the lower layers, often emitting a dull glow from the internal heat within.
Helium-rich Very Rare Helium-rich gas giants have a greatly inflated percentage of helium compared to the hydrogen in their atmosphere. Much of their hydrogen has been lost over time because they have insufficient mass to hold on to it. It may also be because temperatures in their past were much higher, driving off the hydrogen at a greater rate.
Helium Gas Giant Extremely Rare Helium gas giants have primarily a helium atmosphere. They have lost most or all of their hydrogen because they have insufficient mass to hold on to it over time. It may also be because temperatures in their past were much higher, driving off the hydrogen at a greater rate.
Gas Giant with ammonia-based life Very Rare Gas giant with ammonia-based life. This is primarily a hydrogen and helium-based atmospheric gas giant, but a little below the surface cloud layers,life exists based in the ammonia-cloud layer. The chemistry of this gaseous region is far from equilibrium, with a surprising excess of oxygen and many carbon-based compounds giving it some vivid colours. As with many such gaseous living systems, it is underpinned by vast quantities of free-floating radioplankton - tiny carbon-based algae, each retaining small quantity of liquid ammonia, extracting their energy from the intense radiation flux.
  • Gas giant, water based
Gas Giant with water-based life Very Rare Gas giant with water-based life. This is primarily a hydrogen and helium based atmospheric gas giant, but not far below the surface exists life based in the water-cloud layer just below the atmospheric surface. The chemistry of this gaseous region is far from equilibrium, with a surprising excess of oxygen and many carbon-based compounds giving it some vivid colours. As with many such gaseous living systems, it is underpinned by vast quantities of free-floating radioplankton - tiny carbon-based algae, each retaining small quantity of liquid water, extracting their energy from the intense radiation flux.
  • Water Giant
Water Giant Very Rare Water giant. Worlds like this have a large atmosphere made mainly of water vapour. It most likely formed when a large icy body warmed up enough to evaporate a large amount of its surface ice, this would in turn trigger a runaway greenhouse effect leading to a very thick atmosphere made of the evaporated ices.

Largest landable planets

These are the largest known landable planets in the galaxy. They were discovered by commanders. Check the forum thread for the full list.[2]

Rank Radius System Body Type Reported by
1 25,503.96 km EOL PROU HR-U D3-2494 3 Icy body CMDR Ishtar Nixx
2 25,202.13 km WEQAEA TN-K D8-53 1 Icy body duckofdeath
3 24,403.61 km CHROABS TI-S D4-58 4 Icy body CMDR Raj Matheo
4 24,353.34 km BLU AESCS LQ-X D1-11 2 Icy body CMDR King-Crimson
5 24,306.84 km THUECHO NU-B C15-2 2 Icy body crnook
6 24,276.33 km STOCK 1 SECTOR AQ-X D1-22 1 Icy body Gallus Domesticus
7 23,605.51 km OEPHAIDST RU-M D8-709 2 Icy body CMDR Varonica
8 23,525.00 km GLUDGEIA BD-T C4-5 2 Icy body CMDR Setterllew
9 23,346.00 km HYPUAE SCRUA QP-N D7-196 3 Icy body ick
10 23,310.22 km FROARSTS CM-M D7-2210 2 Icy body CMDR chavaplx 

Smallest landable planets

These are the smallest known landable planets.

Rank Radius System Body Type Reported by
1 417 km Kushen 1 High metal content CMDR Nickolai Firemoth[3]

Videos

References

  1. https://www.universetoday.com/85749/is-the-moon-a-planet/
  2. Really large landable planets: the list. (MK II)
  3. Smallest "planet" I have ever landed on.
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