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Strolling on Jupiter

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You're not sure how you even landed on the surface of a gas giant. But it's probably best not to think about it for too long...
EVA report from the surface of Jool, Kerbal Space Program

These days, it's pretty well known that the four largest planets in our solar system lack anything resembling "solid ground." The gas giants Jupiter and Saturn are almost entirely composed of a gassy atmosphere, and the ice giants Uranus and Neptune are mostly a mix of semiliquid methane and water misleadingly called "ices". If they do happen to contain any solid cores, they would be under so much pressure from the super-thick atmospheres above them that any landing attempts would be impossible by modern technology. However, this wasn't always known, and some sci-fi authors speculated that there might be solid ground under the cloud layers which might even support life.

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While some massive exosolar planets that appear to be solid have been observed, it's highly unlikely that they have environments anything like Earth's. This trope is primarily concerned with planets that have a surface with native life, or at least capable of supporting visitors.

If these planets are inhabited, it's Solar System Neighbors. Since these planets tend to have higher gravity than Earth their inhabitants tend to be Heavy Worlders. However, in some works, this aspect may also be ignored outright, and the high gravity not even mentioned. See Once-Green Mars and Venus Is Wet for other discredited models of other planets. For gas giant life that doesn't rely on a solid surface try Living Gasbag or Flying Seafood Special.


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Examples:

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    Film 
  • In Beetlejuice ghosts that attempt to leave their designated haunting zone are transported to Saturn, which is portrayed as a vast desert populated by Sand Worms that attempt to eat them.

    Literature 
  • "Call me Joe", by Poul Anderson, has a traversable Jupiter, except it has no known sapient life. An artificial remotely controlled humanoid is sent to conduct scientific research under the conditions. At one point it is remarked the situation shouldn't exist according to what is known, and no one is certain what the reason is; enough asteroids pulled in to form a solid surface, or a more fundamental error.
  • Captain Underpants: At the end of The Adventures of Super Diaper Baby, Super Diaper Baby and Diaper Dog get rid of the evil Deputy Doo-Doo by tying him in toilet paper and marooning him on Uranus, which is completely solid (and much smaller).
  • In "A Conquest of Two Worlds", a Edmond Hamilton short story, one of the titular worlds is Jupiter, with a solid surface and humanoid natives.
  • In the Hyperborean Cycle by Clark Ashton Smith, Saturn has an ashy surface, liquid metal lakes, and a wide variety of alien inhabitants. Human visitors in the 1932 short story "The Door to Saturn" find it perfectly hospitable and end up living there.
  • John Carter of Mars: In the final book, Skeleton Men of Jupiter, John Carter is taken from Mars to Jupiter. Like Mars, the planet is depicted with a solid surface that has even forests and water, and is inhabited by two sentient races.
  • Last and First Men: The Ninth Men are designed to colonize Neptune after the Sixth-Eighth Men's homeworld of terraformed Venus becomes too hot to support life. Despite their Heavy Worlder physiology Nineth Man society collapses quickly but eventually a succession of eight other sapient species evolve from their descendants on Neptune, and the Eighteenth Men are mentioned to use Jupiter and Saturn as agricultural colonies.
  • "Micromégas" has a humanoid native of Saturn as one of the characters.
  • "Not Final": Jupiter has, beneath miles of increasingly thick atmosphere, a solid surface inhabited by a xenophobic alien race who set out to exterminate humanity when they make radio contact with a colony on Ganymede. In the sequel "Victory Unintentional" a trio of heavily overengineered robots are sent down to Jupiter's surface to ascertain the Jovians' technology, it's under a million Earth atmospheres of pressure at a temperature of -70 degrees Celsius. Neither the environments nor the Jovians' heat rays phase the robots in the slightest, and the Jovians surrender thinking they were humans.
  • Ricky Ricotta's Mighty Robot: All of the gas giants are depicted as having surfaces and life — the Jurassic Jackrabbits from Jupiter, the Stupid Stinkbugs from Saturn, the Uranium Unicorns from Uranus, and the Naughty Nightcrawlers from Neptune.
  • All the planets of the Solar System are habitable in the Captain Future books, including gas giants (and moons too small to hold atmosphere, but that's a different trope).
  • In the Clifford Simak short story, "Desertion" (found in City), Jupiter is a solid planet covered by howling winds. Humans have be transformed into Jovian lifeforms in order to go outside. And once they do, they never come back...
  • Philip K. Dick sometimes references colonies on Jupiter, Uranus, and Neptune, implying that they are similar to bases on Luna (the Moon) and Mars.
  • From Robert A. Heinlein:
    • Strongly implied in Tunnel in the Sky, which refers to the "steel-limbed Jovians" who "enjoy gravity 2.5 times ours" and "poisonous air at inhuman pressure".
    • "Jovians" are also mentioned in "—We Also Walk Dogs". Neither they nor their homeworld are directly described, but they are described as requiring a high-gravity environment to be comfortable (provided by a centrifuge—or using artificial gravity), but their "apartments" otherwise seem to be rooms with floors and so on, not some kind of tank for living gasbags.

    Tabletop Games 
  • Dungeon Magazine issue #101 had "Iron Lords of Jupiter", a setting for d20 Modern that was a Genre Throwback to John Carter of Mars-style Planetary Romances set on the rocky surface of Jupiter that lay at the core of its enormous atmosphere.
  • Urban Jungle: The "Astounding Science" supplement has life on all four giant planets, in homage to its' serial and pulp inspirations. Jupiter and Uranus have solid ground beneath their clouds, inhabited by hexapedal felines and silicoid armadillos respectively. While Neptune is a water world with shark people. Saturn might actually be a gas giant but the rings have an envelope of breathable air and dragon-like residents flying between the ice chunks.
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    Video Games 
  • Endless Space: Gas giants can be colonized after researching the appropriate technology. The changes to the gas giants' graphics when they're colonized make it clear that the colonies are on the surface of the gas giant and not orbiting habitats.
  • Up to Eleven in Futurama, where the frigging SUN (which is actually a star, but Tropes Are Flexible) is inhabited!
  • Kerbal Space Program: Early builds included the ability to land on Jool, the fictional solar system's only gas giant. The "surface" was simply a way for the developers to texture the planet without having to do anything too different. Getting there would even reward the player unique messages from the scientific equipment lampshading the absurdity of the situation, and, of course, the treat of wandering around a featureless green plain. Subsequent versions would make it harder and harder the land on Jool, culminating with the "surface" finally being removed altogether.
  • StarFlight: It's possible to land on gas giants, but you will immediately be crushed by their strong gravity.

    Western Animation 
  • The Fairly OddParents: Jupiter is seen in "Love Triangle", where it's depicted as a rocky, brown surface with mountains. There's even life on it, in the form of a giant, blue cyclops alien.
  • Futurama: The Planet Express crew visits the north pole of Neptune to deliver letters to Robot Santa. It's shown to have a breathable atmosphere, covered in solid ice, and inhabited by four-armed Neptunians and Yetis.
  • I Am Weasel: The titular character earned a statue for being the first being that landed on Mars, Jupiter, and Uranus, despite the latter two being a gas giant and an ice giant respectively.
  • Looney Tunes: In the short "Jumpin' Jupiter", Porky Pig and Sylvester are abducted by an alien from Jupiter, and by the end, the pair end up on the surface of what is most likely Jupiter.
  • SpongeBob SquarePants: In "Mooncation", Sandy briefly slides across the rings of Saturn as if they were ice.
  • The Fangface episode "Dr. Lupiter and the Thing from Jupiter" opens with a rocket ship landing on the surface of Jupiter.

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