--- title: A field guide to the giants canonical_url: https://paxabyssi.com/articles/a-field-guide-to-the-giants markdown_url: https://paxabyssi.com/articles/a-field-guide-to-the-giants.md type: article article_kind: feature kicker: Planets byline: The Pax Abyssi team published: 2026-09-28 last_updated: 2026-10-06 license: Copyright the Pax Abyssi team summary: Pax Abyssi sorts every giant planet it generates into 41 types, from calm pinstriped Jupiters to worlds that glow by their own heat. This guide shows every one of them as our gas giant generator draws it, what you are looking at, the physics that paints it, and why we grow them rather than paint them. topics: - Clouds - Gas giants - Hot Jupiters - Ice giants - Planet classes - Procedural generation related: - https://paxabyssi.com/wiki/Gas_giant.md - https://paxabyssi.com/wiki/Cold_gas_giant.md - https://paxabyssi.com/wiki/Temperate_gas_giant.md - https://paxabyssi.com/wiki/Hot_Jupiter.md - https://paxabyssi.com/wiki/Ice_giant.md - https://paxabyssi.com/wiki/Sudarsky_classification.md --- # A field guide to the giants *Pax Abyssi sorts every giant planet it generates into 41 types, from calm pinstriped Jupiters to worlds that glow by their own heat. This guide shows every one of them as our gas giant generator draws it, what you are looking at, the physics that paints it, and why we grow them rather than paint them.* > Source: https://paxabyssi.com/articles/a-field-guide-to-the-giants > > Feature · Planets · By The Pax Abyssi team · Published 28 September 2026 · Updated 6 October 2026 · 19 min read > > Licence: [Copyright the Pax Abyssi team](https://paxabyssi.com/legal/licensing). Quote with a link back ## In brief - A giant planet's face is the top of one cloud, and temperature decides which cloud that is. Pax Abyssi sorts its giants by temperature first, then by the chemistry, heat or haze that tints the cloud, then by the weather. - The result is five families and 41 types, each with its own recipes in our gas giant generator, which grows every feature our painted maps once carried: belts, festoons, great spots, polar hexagons and haze. - Because the weather is computed, every giant is its own world, and the detail holds as a ship closes in, down to about 210 metres a pixel over the cloud tops. ![A cream and brown banded gas giant three-quarters lit against the stars, white oval storms in its belts, and a small orange moon at the right edge of the frame.](https://media.paxabyssi.com/public/d611e5a3095ad0f7474d430c9c848fc463a40dedbc113b35c030bd1c94b90f32/1920.webp) A Turbulent cold giant in Pax Abyssi, two and a half planetary radii out, white oval storms in its belts and one of its moons at the edge of the frame. Arrive at a giant planet and almost everything you see is the top of one cloud. There is no ground, no ocean, no coastline. What reaches the eye is the highest layer of cloud the atmosphere can make, whatever has stained it, whatever haze lies over it, and the pattern the winds have drawn in it. Everything else about the planet, its mass, its interior, its age, shows only through that one surface. Our classification of giant planets is built on that idea, and it is why Pax Abyssi can draw a galaxy of them from physics. Every giant the simulation generates is sorted into one of five families and 41 types by what a pilot would see, and each type has recipes our gas giant generator turns into weather. This is a tour of all of them: what you are looking at, and why it looks that way. ## Reading a giant from the top down The classification asks four questions, in the order the physics answers them. **What is it made of?** A gas giant, like Jupiter or Saturn, is mostly hydrogen and helium. An ice giant, like Uranus or Neptune, is mostly water, methane and ammonia under a thinner envelope of hydrogen. They are different kinds of planet and separate series in the game, each with its own physics engine. **How warm is it?** This is the question that matters most, because temperature decides which substances can condense into cloud, and the highest cloud decides the face. Cold gas giants lie below 150 K, temperate ones between 150 and 700 K, hot ones from 700 K up; ice giants split into a cold family like Uranus and Neptune and a hot family above 350 K. The same sequence of clouds (ammonia, then water, then none, then rock under absorbing sodium and potassium, then rock high enough to see) is the backbone of the five classes David Sudarsky, Adam Burrows and Philip Pinto proposed in 2000 [1]. Their scheme stops at this question; ours goes on to two more, and "The colours of the giants" maps every one of our subtypes to its nearest Sudarsky class. **What colours or hides the cloud?** Here each family asks its own question, because a different physical process is in charge. In cold gas giants it is trace chemistry, which sets the stains. In temperate ones it is haze, the smog ultraviolet starlight makes from methane. In hot ones it is the dayside temperature, which walks a planet through a sequence of condensing minerals. In cold ice giants it is the heat escaping from inside, which decides whether the weather is violent or veiled. **What is the weather doing?** The last level separates planets that share their chemistry and differ in their jets and storms: a calm young Jupiter from a storm-torn old one, a thin haze from a thick one. After that, every giant is its own. The generator gives each planet a random seed and one of up to four variants of its type, so two worlds of the same type share a character and differ in their weather. > **Why temperature picks the top cloud** > > A gas condenses where its own share of the pressure reaches its saturation vapour pressure, and saturation pressure climbs roughly exponentially with temperature. A giant's atmosphere grows warmer with depth, so each trace gas forms a cloud at the level where the temperature profile crosses its condensation curve. Ammonia does so near 150 K, ammonium hydrosulfide near 200 K, water near 250 to 300 K; in hot giants the salts sodium sulfide and potassium chloride condense near 1,000 K, and silicate rock and iron above about 1,500 K [2] [3]. Warm the whole atmosphere and every cloud base sinks. The coolest of them sinks out of sight first, and the next one down becomes the top. That is why one number, the temperature, sorts giant planets so well. ## From painted maps to procedural planets Our first simulator dressed its giants in painted maps: a picture for each type, wrapped around the sphere and painted to match our research on that type. The painted maps gave beautiful fine detail. They also had two limits that no amount of painting could fix. A given map always looks the same, so every giant of a type was the same planet, however many of them the galaxy held. And a map holds a fixed number of pixels, so the closer you fly, the softer it gets, until the picture breaks down into blur. Procedural generation promises to lift both limits: planets computed from rules, each one different, with as much detail as you are willing to compute. In practice procedural planets tend to look alike, and to look dull, smooth noise stretched into stripes. So we set our generator a harder target than variety. Every interesting feature the painted maps carried had to grow out of the modelled physics: the belts and zones, the festoons that hook off Jupiter's equatorial zone, hooked vortices, great spots, Saturn's polar hexagon, layers of haze. Each look was then matched to its painted original. The sliders in this guide set the two side by side. ![A cream and brown banded gas giant, a broad white equatorial zone with brown hooks curling into it, smooth and softly painted.](https://media.paxabyssi.com/public/ba05fbfed97430ac0f576438b55aadda4a9d717a9446bae03d1383fcf880a0e1/900.webp "Painted map: In Pax Abyssi: a Turbulent cold gas giant (GGC-AB-TU), on our painted map and grown by our procedural generator. The hooked festoons are the signature of the type; in the procedural planet the jets on either side of the equatorial zone roll them up.") Painted map: In Pax Abyssi: a Turbulent cold gas giant (GGC-AB-TU), on our painted map and grown by our procedural generator. The hooked festoons are the signature of the type; in the procedural planet the jets on either side of the equatorial zone roll them up. ![The same kind of planet grown procedurally: cream zones and brown belts with finely streaked edges and hooked festoons curling into the white equatorial zone.](https://media.paxabyssi.com/public/4de4aec18398a9461abe7c73034be6b7f7beb0eb8387793e0f54ed0766a14623/900.webp "Procedural: In Pax Abyssi: a Turbulent cold gas giant (GGC-AB-TU), on our painted map and grown by our procedural generator. The hooked festoons are the signature of the type; in the procedural planet the jets on either side of the equatorial zone roll them up.") Procedural: In Pax Abyssi: a Turbulent cold gas giant (GGC-AB-TU), on our painted map and grown by our procedural generator. The hooked festoons are the signature of the type; in the procedural planet the jets on either side of the equatorial zone roll them up. *Figure 1.* A comparison: Painted map and Procedural. Two things change. Every giant is now its own world: planets of one type share a character, and each planet's own seed gives it its own weather. And the detail holds as you close in, because the weather can be computed again, finer, wherever you are looking, so you can skim low over the cloud tops and they stay sharp. The same approach carries over to rocky worlds, where it takes a ship from orbit to the ground without a break and gives it a whole planet to walk. ## How the generator paints a giant The generator starts from a written description of each type, drawn from the game's science documents: its band colours, how many belts and zones, its storms, the chemistry of its cloud decks, and the papers behind them. From that it builds a wind for the planet. The wind is the part that makes the pictures look like weather. At every boundary between a bright zone and a dark belt runs a narrow jet, eastward on the zone's poleward edge and westward on its equatorward edge, so that zones turn one way and belts the other, as spacecraft have measured on Jupiter and Saturn [4]. Each jet is flanked by a staggered row of vortices, the pattern Voyager filmed along Jupiter's jets, and the jet snakes between them, which is what scallops the edges of the bands. Eddies are added at many sizes, and the named storms from the description are placed as vortices whose cores trap their own air and colour. Then, for every point on the planet, the generator follows the wind backwards for forty steps of simulated time and reads the cloud where that parcel of air began. Belts roll up where vortices caught their edges. Plumes grow sheared tails because the jets drew them out. A great storm winds its surroundings into spiral arms because it turns in the shear of its own latitude. None of those shapes is painted; each is where the modelled wind carried the cloud. ![A gas giant's curved limb against black space, a red storm wound into a spiral inside a dark belt, the belt edges rolled into eddies above a pale zone](https://media.paxabyssi.com/public/0bb880eb8b2c1ea281672ec79e85a107d4e208c1fbcbb60f84b4295770151302/1600.webp "In Pax Abyssi: approaching the same kind of storm from a third of a planetary radius above the cloud tops. The red anticyclone's spiral arms are its own rotation winding in the cloud around it, and the belt edges beside it are eddies the modelled jets rolled up.") *Figure 2.* In Pax Abyssi: approaching the same kind of storm from a third of a planetary radius above the cloud tops. The red anticyclone's spiral arms are its own rotation winding in the cloud around it, and the belt edges beside it are eddies the modelled jets rolled up. The cloud itself is one quantity: how high the cloud tops stand. Zones are high, thick ammonia ice; belts are deep and stained. Where the flow lifts a patch of belt air, it takes the zone colour, so a plume in a belt is white, and every gradient the wind has sharpened becomes a crisp filament. A separate staining field carries the chromophores, and a thin haze above everything scatters light at the limb, where the disc darkens toward its edge by Minnaert's law [5]. Because the weather is a calculation and not a painted map, it can be run again at any resolution. On a planet the size of Jupiter the global map has a pixel about 110 kilometres across. As a ship closes in, the game computes finer patches beneath it, each about four times finer than the last, down to about 210 metres a pixel, with smaller eddies that the global map is too coarse to hold. ![A great red storm seen low over a gas giant's limb, its spiral arms blurred and blocky](https://media.paxabyssi.com/public/3f92a0ed91338a6e6959ed3ca873fd8ec61a4f832c541f2bb3b983b895e4575d/1600.webp "The global map: In Pax Abyssi: a great red spot from 8 per cent of the planet's radius above the cloud tops. The global map is too coarse this close; the patch the game computes beneath the ship draws the same storm, from the same wind, at far finer detail.") The global map: In Pax Abyssi: a great red spot from 8 per cent of the planet's radius above the cloud tops. The global map is too coarse this close; the patch the game computes beneath the ship draws the same storm, from the same wind, at far finer detail. ![The same storm from the same point, its spiral arms and the cream bands around it sharp and finely streaked](https://media.paxabyssi.com/public/0b84ecce33bde36223e1ff61f0356ba229bc97259733f4787160aaf904e803b1/1600.webp "The close patch: In Pax Abyssi: a great red spot from 8 per cent of the planet's radius above the cloud tops. The global map is too coarse this close; the patch the game computes beneath the ship draws the same storm, from the same wind, at far finer detail.") The close patch: In Pax Abyssi: a great red spot from 8 per cent of the planet's radius above the cloud tops. The global map is too coarse this close; the patch the game computes beneath the ship draws the same storm, from the same wind, at far finer detail. *Figure 3.* A comparison: The global map and The close patch. ## The cold giants Ten types, all with ammonia ice on top. Sudarsky's scheme has one class for all of them, Class I; ours has four subtypes and ten types, because what separates them, what stains or veils that white deck, is what a pilot sees. The real colouring agents on Jupiter, the chromophores, have not been identified: a leading laboratory candidate forms when sunlight breaks up ammonia and the fragments react with acetylene [6], and sulfur and phosphorus compounds are other candidates. We turn that open question into a rule. A giant rich in ammonia bands cream and brown, like Jupiter; one rich in hydrogen sulfide wears a gold haze, like Saturn; one rich in phosphine a rust-red haze; and a giant poor in all three stays pale. The chemistry the physics engine computes for a planet decides its colour. ![A pale cream gas giant striped with many fine ochre bands and a small white oval storm.](https://media.paxabyssi.com/public/889cae98292f25022e15005d5b5cea4aeac6185007d58bb5eb178e3495b6f5b9/900.webp "GGC-AB-CB · Calm Banded: A barcode of fine cream zones and light ochre belts with smooth edges, the look of a young ammonia-cloud giant whose belts, where sinking air clears away the white ammonia ice, have not yet darkened.") GGC-AB-CB · Calm Banded: A barcode of fine cream zones and light ochre belts with smooth edges, the look of a young ammonia-cloud giant whose belts, where sinking air clears away the white ammonia ice, have not yet darkened. Credit: Pax Abyssi. ![A cream and brown banded gas giant with ragged belt edges and a red oval storm in the southern hemisphere.](https://media.paxabyssi.com/public/70807ee6a14db937bba383badae186a53e743f5f90ee94c501b29188ec92fc7c/900.webp "GGC-AB-SA · Storm Active: Scalloped belt edges, rolled-up eddies and a great red anticyclone, whose rising air lifts reddish compounds above the ammonia cloud.") GGC-AB-SA · Storm Active: Scalloped belt edges, rolled-up eddies and a great red anticyclone, whose rising air lifts reddish compounds above the ammonia cloud. Credit: Pax Abyssi. ![A cream and brown banded gas giant with a broad white equatorial zone and dark hooks of cloud curling into it.](https://media.paxabyssi.com/public/4de4aec18398a9461abe7c73034be6b7f7beb0eb8387793e0f54ed0766a14623/900.webp "GGC-AB-TU · Turbulent: Hook-shaped festoons curl off the edges of the bright equatorial zone, drawn out by the jets on either side of it, over the classic Jupiter pattern of cream zones and brown belts.") GGC-AB-TU · Turbulent: Hook-shaped festoons curl off the edges of the bright equatorial zone, drawn out by the jets on either side of it, over the classic Jupiter pattern of cream zones and brown belts. Credit: Pax Abyssi. ![A dark rust-red gas giant with soft bands, one hemisphere slightly darker than the other.](https://media.paxabyssi.com/public/2466ec381f757a73435c4026b78a5062df2459b9477f5d5c6621f97e40a09540/900.webp "GGC-PR-AS · Asymmetric Haze: Dark rust with one hemisphere a shade deeper than the other, because the absorbing haze that veils the bands is thicker in one half of the planet.") GGC-PR-AS · Asymmetric Haze: Dark rust with one hemisphere a shade deeper than the other, because the absorbing haze that veils the bands is thicker in one half of the planet. Credit: Pax Abyssi. ![A deep brick-red gas giant, almost featureless, its bands barely visible.](https://media.paxabyssi.com/public/7b7667eee4c2af320cb23c9e4ba4d9d5ce219410419ce6edf468e55db33ef1e9/900.webp "GGC-PR-TK · Thick Haze: A deep brick-red globe with its bands almost hidden, because a thick absorbing haze sits above the ammonia cloud deck and softens every edge.") GGC-PR-TK · Thick Haze: A deep brick-red globe with its bands almost hidden, because a thick absorbing haze sits above the ammonia cloud deck and softens every edge. Credit: Pax Abyssi. ![A rust-red gas giant with clear bands and swirls showing through a reddish veil.](https://media.paxabyssi.com/public/75e37f8039848b354a4ac5a64af70413afb96e2ecb64e8c6499b9a0529e23804/900.webp "GGC-PR-TN · Thin Haze: Rust-red bands and eddies showing through a thinner veil of haze, like stripes seen through tinted glass.") GGC-PR-TN · Thin Haze: Rust-red bands and eddies showing through a thinner veil of haze, like stripes seen through tinted glass. Credit: Pax Abyssi. ![An off-white gas giant with faint pale grey bands.](https://media.paxabyssi.com/public/a9057f3c893305d3553db9aa0d43b42c2115b0bc677b657c5e216d996445410d/900.webp "GGC-QP-FB · Faint Banded: Antique white with ghost bands: a giant poor in ammonia, phosphine and hydrogen sulfide has little to build thick clouds or to stain them, so only faint structure shows.") GGC-QP-FB · Faint Banded: Antique white with ghost bands: a giant poor in ammonia, phosphine and hydrogen sulfide has little to build thick clouds or to stain them, so only faint structure shows. Credit: Pax Abyssi. ![A plain white gas giant with no visible bands, darkening toward its edge.](https://media.paxabyssi.com/public/1e5a2201a7f627cab1e9dc0759ca69cf5c0eec4b7e5a52c4707bde3d7131658c/900.webp "GGC-QP-FW · Featureless White: A blank white ball: with every trace gas scarce, a thin, clean haze covers the whole disc and the weather beneath it barely shows.") GGC-QP-FW · Featureless White: A blank white ball: with every trace gas scarce, a thin, clean haze covers the whole disc and the weather beneath it barely shows. Credit: Pax Abyssi. ![A honey-amber gas giant with soft, broad bands.](https://media.paxabyssi.com/public/6ab109312ed74cf6500b2e684a85210756e2219a78a2fbd38c70feb88eca8bbb/900.webp "GGC-SG-DH · Deep Honey: Rich amber with soft bands: a sulfur-bearing haze above the ammonia deck tints the whole planet gold and blurs the band edges.") GGC-SG-DH · Deep Honey: Rich amber with soft bands: a sulfur-bearing haze above the ammonia deck tints the whole planet gold and blurs the band edges. Credit: Pax Abyssi. ![A pale gold gas giant with broad, low-contrast bands, like Saturn.](https://media.paxabyssi.com/public/7d57fe8ddd120aa2bae54b2380caf70b680fa487e488419ee9f7e232702623e6/900.webp "GGC-SG-SG · Soft Gold: Warm gold with broad, soft bands, the Saturn look: in a colder giant the clouds form deeper, under more haze, and the contrast between belts and zones fades.") GGC-SG-SG · Soft Gold: Warm gold with broad, soft bands, the Saturn look: in a colder giant the clouds form deeper, under more haze, and the contrast between belts and zones fades. Credit: Pax Abyssi. *Figure 4.* In Pax Abyssi: the ten cold gas giant types, drawn by our gas giant generator near full phase. Within each chemistry the weather sets the type. Calm Banded giants are young, their belts still light ochre and their jets laminar. Storm Active ones are older and darker, their belt edges scalloped and a great red anticyclone lifting coloured material above the ammonia cloud. The Phosphine-Ruddy family runs from a thin veil, through which the bands still show, to a haze so thick the planet reads as one deep brick-red globe. ## The temperate giants Between 150 and 700 K a giant changes more than anywhere else, and the eight temperate types follow it through. This one family spans two of Sudarsky's classes, II and III, and the changeover between them. First the ammonia cloud sinks and thins, and the bands bleach. Then, near 200 to 250 K, water starts to condense high enough to become the top cloud, breaking through the grey in brilliant white patches. A planet covered in water-ice cloud would be the most reflective of any kind: Sudarsky's model for it reflects 81 per cent of the light that falls on it [1]. Above about 350 K the water evaporates too, and nothing condenses high in the atmosphere at all. Starlight sinks deep, hydrogen scatters the blue back and methane absorbs the red, and the planet turns a dark, featureless azure. ![A grey-cream gas giant with washed-out pale bands.](https://media.paxabyssi.com/public/e84ff3b473b7b9327d5b63fb5b9009978f3a9cbf54d5abce6ca570bb51afc912/900.webp "GGT-TN-FD · Fading Ammonia: Bleached cream bands on a grey-cream globe: above about 150 K the ammonia cloud forms deeper and thins, and no water cloud has yet taken its place.") GGT-TN-FD · Fading Ammonia: Bleached cream bands on a grey-cream globe: above about 150 K the ammonia cloud forms deeper and thins, and no water cloud has yet taken its place. Credit: Pax Abyssi. ![A white gas giant crossed by torn grey streamers and patches of cloud.](https://media.paxabyssi.com/public/750ac3baa3db71696b6a182fc079b6423f8614d05412813cef9b87fd6015f711/900.webp "GGT-TN-EM · Emerging Water: Brilliant white water-ice cloud spreading across a grey planet, the last grey patches drawn out into streamers by the jets: near 200 to 250 K, water starts to condense high enough to become the top cloud.") GGT-TN-EM · Emerging Water: Brilliant white water-ice cloud spreading across a grey planet, the last grey patches drawn out into streamers by the jets: near 200 to 250 K, water starts to condense high enough to become the top cloud. Credit: Pax Abyssi. ![A brilliant white gas giant with no visible features.](https://media.paxabyssi.com/public/fefff52669b1bd708bee6343feb7960bc656bde1014c8ee26ca6ad4488827ab0/900.webp "GGT-WC-BW · Brilliant White: Near-uniform brilliant white: a thick deck of water-ice cloud reflects most of the light that reaches it, and Sudarsky's model for this class reflects 81 per cent.") GGT-WC-BW · Brilliant White: Near-uniform brilliant white: a thick deck of water-ice cloud reflects most of the light that reaches it, and Sudarsky's model for this class reflects 81 per cent. Credit: Pax Abyssi. ![A white gas giant with soft pale blue bands.](https://media.paxabyssi.com/public/8914589f6a6cfa9d64978bc598d0eafb0e213504178ea67510c0cd0bf9f165d4/900.webp "GGT-WC-PB · Pale Banded: White zones and pale blue belts: where drier air sinks, the water cloud thins and the blue light scattered by the clear hydrogen above shows through.") GGT-WC-PB · Pale Banded: White zones and pale blue belts: where drier air sinks, the water cloud thins and the blue light scattered by the clear hydrogen above shows through. Credit: Pax Abyssi. ![A vivid azure gas giant with no bands or storms.](https://media.paxabyssi.com/public/2e51e745b6bfad171685e9f1907bc79d1cc23e7d80ea20e5f37a876e81b38c61/900.webp "GGT-CB-AZ · Azure: Vivid, featureless azure: above about 350 K nothing condenses high in the atmosphere, so hydrogen scatters blue light back to space while methane absorbs the red.") GGT-CB-AZ · Azure: Vivid, featureless azure: above about 350 K nothing condenses high in the atmosphere, so hydrogen scatters blue light back to space while methane absorbs the red. Credit: Pax Abyssi. ![A dark navy-blue gas giant with no visible features.](https://media.paxabyssi.com/public/f41c9aad0fdb3ba5525ad7c340e5224d34e37e1c0d4208eed89c567460397948/900.webp "GGT-CB-DP · Deep Blue: A dark, featureless navy: in a warmer clear atmosphere more of the red and near-infrared light is absorbed on its way in, and little returns.") GGT-CB-DP · Deep Blue: A dark, featureless navy: in a warmer clear atmosphere more of the red and near-infrared light is absorbed on its way in, and little returns. Credit: Pax Abyssi. ![A muted grey-blue gas giant with faint soft bands.](https://media.paxabyssi.com/public/ae498061e5f3c1ada929541420ac8509160ea3c7224295f520a1b1edc9a8bba8/900.webp "GGT-HZ-SM · Smoky Blue: Blue seen through smoke: a thin photochemical haze, made when ultraviolet starlight breaks up methane high in the atmosphere, greys and softens the clear-sky blue.") GGT-HZ-SM · Smoky Blue: Blue seen through smoke: a thin photochemical haze, made when ultraviolet starlight breaks up methane high in the atmosphere, greys and softens the clear-sky blue. Credit: Pax Abyssi. ![A tawny brown gas giant with no visible features.](https://media.paxabyssi.com/public/1c6d9f014f06695f64631e17553bc2087ff8104eebedaa9170cd02bb698cb2b7/900.webp "GGT-HZ-TN · Tawny Haze: A tawny, featureless globe: a thick haze absorbs blue light and scatters warmer colours, burying the blue beneath it.") GGT-HZ-TN · Tawny Haze: A tawny, featureless globe: a thick haze absorbs blue light and scatters warmer colours, burying the blue beneath it. Credit: Pax Abyssi. *Figure 5.* In Pax Abyssi: the eight temperate gas giant types, cool to warm, drawn by our gas giant generator near full phase. Photochemical haze complicates the blue end. Ultraviolet light breaks methane apart high in the atmosphere and the fragments build smog, which greys the blue and, when it is thick, buries it under tawny brown [7]. Haze grows with the star's ultraviolet output and the planet's metallicity, so in the game most giants warmer than 350 K end up hazy and the vivid blue ones are rare finds. No real giant in this temperature range has yet had its colour measured by a telescope. > The blue giant has no bands because it has no cloud high enough to trace its winds. The jets and storms are all still there, turning, invisible. ## The hot giants From 700 K up the cloud sequence continues into minerals, through the range of Sudarsky's Classes IV and V. Sulfides and salts condense first, then silicate rock, then iron, and at the top of the range no cloud survives at all [3] [8]. Most hot Jupiters measured so far are very dark, darker than Sudarsky's brightest predictions, because sodium, potassium and molecules such as water soak up the light before it can reflect [1]. Our hot giants follow the measurements. The simulation sorts hot giants into six subtypes by dayside temperature: Methane-Jade, Silicate-Sapphire, Ferro-Copper, Opaline, Ashen and Ultra-Dark. The coolest, Methane-Jade, is our boldest palette: methane still survives there, it absorbs red light, and we draw the result as green, a colour no telescope has measured on a real planet. Silicate-Sapphire takes the deep blue Hubble measured on HD 189733 b, where a high haze scatters blue light and sodium absorbs the rest [9]. Ferro-Copper is hot enough that iron is vapour by day and condenses where the air cools, as it is thought to on WASP-76 b [10]. The hottest, Ultra-Dark, reflects almost nothing. ![A green banded gas giant with lighter yellow-green bands and small swirls.](https://media.paxabyssi.com/public/52cfa03c8a84acf51254050161597a89440ff3f56bd0077f8e78ed192d2d43d3/900.webp "GGH-MJ-BG · Methane-Jade, Bright: Jade bands on the coolest hot giants, where methane still holds some of the carbon: methane absorbs red light, and we draw the result as green, a colour no telescope has yet measured on a real planet.") GGH-MJ-BG · Methane-Jade, Bright: Jade bands on the coolest hot giants, where methane still holds some of the carbon: methane absorbs red light, and we draw the result as green, a colour no telescope has yet measured on a real planet. Credit: Pax Abyssi. ![A darker green gas giant with subdued bands.](https://media.paxabyssi.com/public/d442f92c1ec8e255a7ed3a7d209c16fe118ce4af3e8b0d31e41beff493a7d846/900.webp "GGH-MJ-DG · Methane-Jade, Deep: A deeper, darker jade with softer bands, the same methane-bearing chemistry under more haze.") GGH-MJ-DG · Methane-Jade, Deep: A deeper, darker jade with softer bands, the same methane-bearing chemistry under more haze. Credit: Pax Abyssi. ![A muted blue-grey gas giant with faint streaks.](https://media.paxabyssi.com/public/f78988d88db1da74105d74928b8706978e82c7438b131e6d38055a69fddd9141/900.webp "GGH-SS-AZ · Silicate-Sapphire: Muted blue with faint streaks: a high haze or cloud scatters blue light while sodium absorbs the longer wavelengths, the pattern Hubble measured on HD 189733 b.") GGH-SS-AZ · Silicate-Sapphire: Muted blue with faint streaks: a high haze or cloud scatters blue light while sodium absorbs the longer wavelengths, the pattern Hubble measured on HD 189733 b. Credit: Pax Abyssi. ![A copper-orange gas giant with darker brown bands.](https://media.paxabyssi.com/public/0208466f5fd9fa32e56eb1fcbc2d64b2a848293076fdd1b322005a071671b220/900.webp "GGH-FC-IR · Ferro-Copper: Copper-orange bands on a giant hot enough that iron is vapour on its day side and condenses into cloud where the air cools, as it is thought to on WASP-76 b.") GGH-FC-IR · Ferro-Copper: Copper-orange bands on a giant hot enough that iron is vapour on its day side and condenses into cloud where the air cools, as it is thought to on WASP-76 b. Credit: Pax Abyssi. ![A pale pearly gas giant with soft pink and blue-green bands.](https://media.paxabyssi.com/public/6a012d2c6adffe662a141fc303c3b2c9b53865684c3638ec80e2ce0f9bb9d5f2/900.webp "GGH-OP-PR · Opaline: A pale, pearly disc: corundum, aluminium oxide, condenses at the highest temperature of any common mineral, so its thin clouds are the last to survive as a giant heats, and we give them a pearlescent sheen.") GGH-OP-PR · Opaline: A pale, pearly disc: corundum, aluminium oxide, condenses at the highest temperature of any common mineral, so its thin clouds are the last to survive as a giant heats, and we give them a pearlescent sheen. Credit: Pax Abyssi. ![A dark charcoal-grey gas giant with faint swirling bands.](https://media.paxabyssi.com/public/087b73ac9368dfb51f4ba20f17e0dd3daa1eda1ac7d1e0ac4cd1810d131e52cf/900.webp "GGH-AS-SM · Ashen: Charcoal under a smog layer: an atmosphere this hot absorbs most of the light that falls on it and scatters little back.") GGH-AS-SM · Ashen: Charcoal under a smog layer: an atmosphere this hot absorbs most of the light that falls on it and scatters little back. Credit: Pax Abyssi. ![An almost black planet, barely visible against space, with a faint dark red tint.](https://media.paxabyssi.com/public/65edb2ea38e453cf5d20ad5c874cacffcc4534d3e62d6759b19b50abe9c7255d/900.webp "GGH-UD-VD · Ultra-Dark: Barely visible against space: above about 2,200 K molecules break apart and the negative hydrogen ion absorbs across the visible, leaving a planet darker than coal that glows faintly red by its own heat.") GGH-UD-VD · Ultra-Dark: Barely visible against space: above about 2,200 K molecules break apart and the negative hydrogen ion absorbs across the visible, leaving a planet darker than coal that glows faintly red by its own heat. Credit: Pax Abyssi. *Figure 6.* In Pax Abyssi: the seven hot giant types, cooler to hotter, drawn by our gas giant generator near full phase. The hot giants were the hardest test for the generator, because their painted maps lean on colour and soft structure rather than on sharp storms. Here are two of them, painted and grown. ![A copper-orange gas giant with dark brown bands and swirling cloud, painted.](https://media.paxabyssi.com/public/8a2970456d5a7afc2e26c9fc6c6e0b3c66ffae43dee2eff8180d91b3e76e368a/900.webp "Painted map: In Pax Abyssi: a Ferro-Copper hot giant (GGH-FC-IR), on our painted map and grown by our procedural generator: copper-orange bands on a planet hot enough for iron cloud.") Painted map: In Pax Abyssi: a Ferro-Copper hot giant (GGH-FC-IR), on our painted map and grown by our procedural generator: copper-orange bands on a planet hot enough for iron cloud. ![The same kind of planet grown procedurally: copper-orange bands with darker brown belts and small swirls.](https://media.paxabyssi.com/public/0208466f5fd9fa32e56eb1fcbc2d64b2a848293076fdd1b322005a071671b220/900.webp "Procedural: In Pax Abyssi: a Ferro-Copper hot giant (GGH-FC-IR), on our painted map and grown by our procedural generator: copper-orange bands on a planet hot enough for iron cloud.") Procedural: In Pax Abyssi: a Ferro-Copper hot giant (GGH-FC-IR), on our painted map and grown by our procedural generator: copper-orange bands on a planet hot enough for iron cloud. *Figure 7.* A comparison: Painted map and Procedural. ![A deep green gas giant with yellow-green streaks along its bands, painted.](https://media.paxabyssi.com/public/19409e0c62e3ff8670407dd69ec4bf7679f29c7e95fae6535e3e20da6668de3f/900.webp "Painted map: In Pax Abyssi: a deep Methane-Jade hot giant (GGH-MJ-DG), on our painted map and grown by our procedural generator, its yellow-green streaks drawn out along the jets.") Painted map: In Pax Abyssi: a deep Methane-Jade hot giant (GGH-MJ-DG), on our painted map and grown by our procedural generator, its yellow-green streaks drawn out along the jets. ![The same kind of planet grown procedurally: deep green bands with yellow-green streaks drawn out along the jets.](https://media.paxabyssi.com/public/d442f92c1ec8e255a7ed3a7d209c16fe118ce4af3e8b0d31e41beff493a7d846/900.webp "Procedural: In Pax Abyssi: a deep Methane-Jade hot giant (GGH-MJ-DG), on our painted map and grown by our procedural generator, its yellow-green streaks drawn out along the jets.") Procedural: In Pax Abyssi: a deep Methane-Jade hot giant (GGH-MJ-DG), on our painted map and grown by our procedural generator, its yellow-green streaks drawn out along the jets. *Figure 8.* A comparison: Painted map and Procedural. ## The ice giants Uranus and Neptune are near twins in size and mass, and they look different because of heat. Neptune radiates about 2.6 times the energy it absorbs from the Sun [11], and it has the fastest winds in the Solar System and dark storms the size of Earth; Voyager 2 photographed one in 1989 that was gone five years later [12]. Uranus gives off little heat of its own, wears a thicker haze and shows far fewer storms. Our cold ice giants take that as their dividing line: Active, with strong internal heat, thin haze and dark spots, and Quiescent, with little heat and thick haze. The haze sets the type. Thin haze lets light reach deep enough for methane to strip out the red; thick haze reflects it first, which is why Uranus is paler than Neptune [13]. Our Active ice giants wear the deep blue of Voyager's Neptune portraits, because it is the Neptune most people picture and it shows the storms well. The real Neptune is a paler greenish blue, only a shade bluer than Uranus; Voyager's images were contrast-enhanced to bring out the clouds [13]. The Quiescent giants show that paler end of the range. Ice giants are a series of their own in our scheme; Sudarsky's classes, built for hydrogen and helium giants of Jupiter's mass, do not cover them. ![The lit limb of a blue ice giant filling most of the frame, soft pale streaks of cloud drawn out along its bands, the edge of a ring at the far left and black space beyond](https://media.paxabyssi.com/public/0cbd73a5a6b078014e19631616893944a43206c17a4a62e42b56ff4c912e6e8e/1240.webp "In Pax Abyssi: close over an active cold ice giant, its cloud streaked along the jets and the edge of its ring at left.") *Figure 9.* In Pax Abyssi: close over an active cold ice giant, its cloud streaked along the jets and the edge of its ring at left. ![A bright blue ice giant with soft bands and a few thin white clouds, painted.](https://media.paxabyssi.com/public/fbc15ab51ff3941b3711c5cfa60608fbb5d4c2deca748f0b3d6bf811a18d6720/900.webp "Painted map: In Pax Abyssi: a Bright Blue active ice giant (IGC-CA-BR), on our painted map and grown by our procedural generator, with thin white streaks of methane-ice cloud riding above the main deck.") Painted map: In Pax Abyssi: a Bright Blue active ice giant (IGC-CA-BR), on our painted map and grown by our procedural generator, with thin white streaks of methane-ice cloud riding above the main deck. ![The same kind of planet grown procedurally: bright blue with soft bands and thin white streaks of high cloud.](https://media.paxabyssi.com/public/ccfbea30b324ee501ff37f5423a1e5e466350a488d8f235cd25c90a119462483/900.webp "Procedural: In Pax Abyssi: a Bright Blue active ice giant (IGC-CA-BR), on our painted map and grown by our procedural generator, with thin white streaks of methane-ice cloud riding above the main deck.") Procedural: In Pax Abyssi: a Bright Blue active ice giant (IGC-CA-BR), on our painted map and grown by our procedural generator, with thin white streaks of methane-ice cloud riding above the main deck. *Figure 10.* A comparison: Painted map and Procedural. ![A deep blue planet with faint bands, a dark oval storm and a bright white cloud beside it.](https://media.paxabyssi.com/public/0e8af2bbfe2a36a77395f76eefed66ed23a55aa5caaaf1f93d0d4ab426d13fc9/900.webp "IGC-CA-DP · Deep Azure: Deep azure with a dark oval and a bright companion cloud: a thin haze lets light reach deep, where methane strips the red and hydrogen scatters the blue, and strong internal heat drives dark storms like the one Voyager 2 saw on Neptune.") IGC-CA-DP · Deep Azure: Deep azure with a dark oval and a bright companion cloud: a thin haze lets light reach deep, where methane strips the red and hydrogen scatters the blue, and strong internal heat drives dark storms like the one Voyager 2 saw on Neptune. Credit: Pax Abyssi. ![A royal blue planet with a few thin white cloud streaks.](https://media.paxabyssi.com/public/d63fc2a5d57dc73383d0d6d9a44a41f53d50d87a8954d4617388da6cae1e2ab9/900.webp "IGC-CA-RY · Royal Blue: Royal blue with thin white streaks of methane-ice cloud riding above the main deck, and no dark spot.") IGC-CA-RY · Royal Blue: Royal blue with thin white streaks of methane-ice cloud riding above the main deck, and no dark spot. Credit: Pax Abyssi. ![A bright blue planet with soft visible bands and faint white clouds.](https://media.paxabyssi.com/public/ccfbea30b324ee501ff37f5423a1e5e466350a488d8f235cd25c90a119462483/900.webp "IGC-CA-BR · Bright Blue: A brighter blue with soft but visible bands under a slightly thicker haze.") IGC-CA-BR · Bright Blue: A brighter blue with soft but visible bands under a slightly thicker haze. Credit: Pax Abyssi. ![A teal-cyan planet, almost featureless.](https://media.paxabyssi.com/public/4cf7168bff1aa9f736c63f087060cd70f1aa76dfbac8fc9599ae47fb3c449a27/900.webp "IGC-CQ-TL · Teal: Cool teal with only the ghost of structure: with little internal heat to drive convection, haze builds up and hides the weather.") IGC-CQ-TL · Teal: Cool teal with only the ghost of structure: with little internal heat to drive convection, haze builds up and hides the weather. Credit: Pax Abyssi. ![A smooth pale cyan planet with no visible features.](https://media.paxabyssi.com/public/7344f03e095cd7f2d6126fd309246c101cff5f1684c02c650f276c1febfce969/900.webp "IGC-CQ-CY · Pale Cyan: A smooth, pale cyan ball, the Uranus look: light reflects off the thick haze before methane can absorb much of the red.") IGC-CQ-CY · Pale Cyan: A smooth, pale cyan ball, the Uranus look: light reflects off the thick haze before methane can absorb much of the red. Credit: Pax Abyssi. ![A very pale, near-white aqua planet.](https://media.paxabyssi.com/public/a58ef6a77580fad9fa9cfd3b3f1c3119a402ae48597630154b800fbe88b052e4/900.webp "IGC-CQ-AQ · Palest Aqua: Near-white aqua under the thickest haze of all, so bright that methane's colour barely shows.") IGC-CQ-AQ · Palest Aqua: Near-white aqua under the thickest haze of all, so bright that methane's colour barely shows. Credit: Pax Abyssi. *Figure 11.* In Pax Abyssi: the six cold ice giant types, Active then Quiescent, drawn by our gas giant generator near full phase. Move a Neptune-mass planet close to its star and methane can no longer freeze. The hot ice giants run through three regimes as they warm. The coolest are veiled in cloud, with water as the top cloud at the cool end. Then the clouds and hazes are gone and the clear hydrogen atmosphere scatters blue light back, a vivid blue with nothing on it. Hottest of all, sodium and potassium vapour absorb across the visible, as on the dark hot Jupiters, and the planet turns grey-brown, then copper, then almost black. It is the walk the gas giants take, from water cloud to clear sky to alkali-darkened air, in a smaller planet. ![A pale blue-grey ice giant lit from the left, almost featureless, inside a broad dark brown ring that sweeps around it against the stars](https://media.paxabyssi.com/public/e141b41f72c955b4708b37380195af6f5a83bbe48c7df20d8d035d53bbdf6372/2400.webp "In Pax Abyssi: a Rayleigh-Blue hot ice giant (IGH-RB) and its ring, three planetary radii out. Too warm for methane ice, its clear hydrogen sky scatters blue light back to space.") *Figure 12.* In Pax Abyssi: a Rayleigh-Blue hot ice giant (IGH-RB) and its ring, three planetary radii out. Too warm for methane ice, its clear hydrogen sky scatters blue light back to space. ![A pale blue-white planet swirled with white cloud patches.](https://media.paxabyssi.com/public/8bccadeed9160b8e9699567a3de8245c91da36893bbaf5cf2185e822487795f1/900.webp "IGH-WV-CL · Water-Veiled, Cool: Pale blue-white with soft swirls of cloud: too warm for methane ice, cool enough for water to form the top cloud.") IGH-WV-CL · Water-Veiled, Cool: Pale blue-white with soft swirls of cloud: too warm for methane ice, cool enough for water to form the top cloud. Credit: Pax Abyssi. ![A grey-blue planet with faint pale cloud patches.](https://media.paxabyssi.com/public/238e144750c2b97313ff00dbe9a62450da663cfd0781a1c6f3825f624c8c0f29/900.webp "IGH-WV-MD · Water-Veiled, Mid: Grey-blue with fading patches, the cloud veil thinner and greyer as the planet warms.") IGH-WV-MD · Water-Veiled, Mid: Grey-blue with fading patches, the cloud veil thinner and greyer as the planet warms. Credit: Pax Abyssi. ![A warm grey planet with very faint broad zones.](https://media.paxabyssi.com/public/cd861b9bdf1a521d5520a765cd39150461cc762921363d2212b9ddbb46606dbb/900.webp "IGH-WV-WM · Water-Veiled, Warm: Warm grey with only the last broad, soft traces of cloud structure.") IGH-WV-WM · Water-Veiled, Warm: Warm grey with only the last broad, soft traces of cloud structure. Credit: Pax Abyssi. ![A vivid bright blue planet with no features.](https://media.paxabyssi.com/public/984f3a8cb9fbf9bd872fbf4d5b833dd4731df95b3374e6d3a328618c8d740340/900.webp "IGH-RB-VV · Rayleigh-Blue, Vivid: Vivid, featureless blue: with no cloud or haze left, the clear hydrogen scatters blue light back, a sky with nothing in it.") IGH-RB-VV · Rayleigh-Blue, Vivid: Vivid, featureless blue: with no cloud or haze left, the clear hydrogen scatters blue light back, a sky with nothing in it. Credit: Pax Abyssi. ![A deep cobalt blue planet with no features.](https://media.paxabyssi.com/public/18829485f62520e7a955d8e1f5b39d6d61da1a74e900efe4e5994e3a8a257e58/900.webp "IGH-RB-DP · Rayleigh-Blue, Deep: Deep cobalt, the clear atmosphere darkening as absorption grows with temperature.") IGH-RB-DP · Rayleigh-Blue, Deep: Deep cobalt, the clear atmosphere darkening as absorption grows with temperature. Credit: Pax Abyssi. ![A dark blue planet with a slightly darker band across its middle.](https://media.paxabyssi.com/public/9fdc7ddeca95b51dc517d1cd587a493ed3ca80cb16bd07726e079c694209b625/900.webp "IGH-RB-DK · Rayleigh-Blue, Dark: Dark blue with a faint, darker band at the equator, where sodium and potassium vapour begin to absorb.") IGH-RB-DK · Rayleigh-Blue, Dark: Dark blue with a faint, darker band at the equator, where sodium and potassium vapour begin to absorb. Credit: Pax Abyssi. ![A dark grey-brown planet with no features.](https://media.paxabyssi.com/public/e6bd5783a5cec2722fa963b95be74d87fd6a0813b8d86da97046b3777270a5fe/900.webp "IGH-DS-MO · Dark-Stripped, Moderate: Dark grey-brown: sodium and potassium absorb across the visible and remove the blue.") IGH-DS-MO · Dark-Stripped, Moderate: Dark grey-brown: sodium and potassium absorb across the visible and remove the blue. Credit: Pax Abyssi. ![A dark copper-brown planet with no features.](https://media.paxabyssi.com/public/985e5d8f51ebb91190f116f0a06654e4ca8a966fb5cf858909224773c667528d/900.webp "IGH-DS-ST · Dark-Stripped, Strong: Dark copper-brown and nearly uniform, reflecting only a few per cent of its light.") IGH-DS-ST · Dark-Stripped, Strong: Dark copper-brown and nearly uniform, reflecting only a few per cent of its light. Credit: Pax Abyssi. ![A nearly black planet with a faint charcoal-brown tint.](https://media.paxabyssi.com/public/313db2cd197c35bec8e233c4485d057558a153e673b389519bcf100ae2f3c59e/900.webp "IGH-DS-EX · Dark-Stripped, Extreme: Near-black with a charcoal-brown tint, one of the darkest bodies in the galaxy.") IGH-DS-EX · Dark-Stripped, Extreme: Near-black with a charcoal-brown tint, one of the darkest bodies in the galaxy. Credit: Pax Abyssi. ![A dark copper-brown planet, slightly brighter on one side than the other.](https://media.paxabyssi.com/public/891b84be83508d685e2e999dda84fad99c0c47a7f1b1a823194b68aa0d8f6c66/900.webp "IGH-DSTL-ST · Dark-Stripped, Tidally Locked: Dark copper-brown with a smooth gradient from the warmer day hemisphere to the night side, the mark of a planet that always turns one face to its star.") IGH-DSTL-ST · Dark-Stripped, Tidally Locked: Dark copper-brown with a smooth gradient from the warmer day hemisphere to the night side, the mark of a planet that always turns one face to its star. Credit: Pax Abyssi. *Figure 13.* In Pax Abyssi: the ten hot ice giant types, cooler to hotter, drawn by our gas giant generator near full phase. ## Forty-one That is the whole field guide: ten cold gas giants, eight temperate, seven hot ones, six cold ice giants and ten hot ones, drawn from 93 looks in the generator. Every giant in the generated star systems wears one, with a seed and weather of its own. Fly low enough and the ship enters the cloud deck itself, towers and wisps rising past the canopy until the view closes in, while the hull reads the pressure climbing toward its crush depth. **IN DEVELOPMENT:** every feature a giant shows, its band count, its storms and their colours, read from numbers its own physics computes, so the simulation's science is the single source of what each planet looks like; and weather that moves, each storm drifting at the speed of its own latitude's wind. ## References 1. Sudarsky, D., Burrows, A. and Pinto, P. (2000). Albedo and Reflection Spectra of Extrasolar Giant Planets. The Astrophysical Journal 538, 885-903. 2. Lewis, J. S. (1969). The clouds of Jupiter and the NH3-H2O and NH3-H2S systems. Icarus 10, 365-378. 3. Visscher, C., Lodders, K. and Fegley, B. (2010). Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-mass Dwarf Stars. III. Iron, Magnesium, and Silicon. The Astrophysical Journal 716, 1060-1075. 4. Ingersoll, A. P. et al. (2004). Dynamics of Jupiter's atmosphere. Jupiter: The Planet, Satellites and Magnetosphere 105-128. 5. Minnaert, M. (1941). The reciprocity principle in lunar photometry. The Astrophysical Journal 93, 403. 6. Carlson, R. W. et al. (2016). Chromophores from photolyzed ammonia reacting with acetylene: Application to Jupiter's Great Red Spot. Icarus 274, 106-115. 7. Cahoy, K. L., Marley, M. S. and Fortney, J. J. (2010). Exoplanet Albedo Spectra and Colors as a Function of Planet Phase, Separation, and Metallicity. The Astrophysical Journal 724, 189-214. 8. Parmentier, V. et al. (2018). From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context. Astronomy & Astrophysics 617, A110. 9. Evans, T. M. et al. (2013). The Deep Blue Color of HD 189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths. The Astrophysical Journal Letters 772, L16. 10. Ehrenreich, D. et al. (2020). Nightside condensation of iron in an ultrahot giant exoplanet. Nature 580, 597-601. 11. Pearl, J. C. and Conrath, B. J. (1991). The albedo, effective temperature, and energy balance of Neptune, as determined from Voyager data. Journal of Geophysical Research: Space Physics 96, 18921-18930. 12. Hammel, H. B. et al. (1995). Hubble Space Telescope Imaging of Neptune's Cloud Structure in 1994. Science 268, 1740-1742. 13. Irwin, P. G. J. and et al. (2024). Modelling the seasonal cycle of Uranus's colour and magnitude, and comparison with Neptune. Monthly Notices of the Royal Astronomical Society 527, 11521-11538. Contributors: The Pax Abyssi team ## In the wiki - [Gas giant](https://paxabyssi.com/wiki/Gas_giant.md) - [Cold gas giant](https://paxabyssi.com/wiki/Cold_gas_giant.md) - [Temperate gas giant](https://paxabyssi.com/wiki/Temperate_gas_giant.md) - [Hot Jupiter](https://paxabyssi.com/wiki/Hot_Jupiter.md) - [Ice giant](https://paxabyssi.com/wiki/Ice_giant.md) - [Sudarsky classification](https://paxabyssi.com/wiki/Sudarsky_classification.md)