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Frictionless Reentry
For any spacecraft which travels through the Earth's atmosphere, there's a critical thing which needs to be considered beforehand. Space travel is fast, and hitting the atmosphere at the kind of speed you'd have in orbit will make your spacecraft hot. Very hot note . If you attempt to plow through the air without sufficient shielding, disaster could (and indeed, horrifically, did at one point) occur.

It's fairly common for fiction to ignore this little inconvenient fact, because it means characters and impractically designed spaceships can get onto (or off) a planet without burning up. It simply doesn't include an atmosphere. In some cases, Applied Phlebotinum is used, or the ship simply slows down before reentry to avoid burning up. The later isn't necessarily too unrealistic for a ship which is using nuclear engines, or otherwise doesn't need to worry about fuel (or balancing fuel consumption with arrival time). If you have enough energy, cooling and propellant (the latter two are still needed until the air itself becomes dense enough to be useful), you can move as slowly as you want, but "enough" here is really big. The issue for all current orbital spacecraft is that they need to use most of their fuel to lift fuel (not crew or payload) to the altitude where it will be burned, and a ship that used its engines to slow down would be much more expensive since it'd have to carry even more fuel.

Note this trope does not generally apply to anything with Anti Gravity or similar propulsion systems as such craft would be able to hover over a planet instead of needing to orbit a planet. Orbital rings, shells, elevator or anything else in geo-stationary orbit are also generally exempt as there is no need for them to move at hyper velocities to avoid crashing back down onto the planet. Craft that are in the process of taking off may or may not be exempt if they have not yet accelerated to orbital velocities or if they do not gain any horizontal velocity to escape a planet's orbit.

Contrast Friction Burn, which is the opposite of this trope, and Reentry Scare. Compare Soft Water, a similar problem with using water as an all-purpose safety net. See also Spaceship Slingshot Stunt.


Examples:

    open/close all folders 

    Anime 
  • Averted in Mobile Suit Gundam, given the Real Robot setting of the series. In the first case, Zeon forces don't actually expect the Gundam to be able to make it through reentry...because their own Zakus can't, which is demonstrated by the unlucky pilot Crown and his Zaku melting and shedding parts when he can't make it back to the Musai. The Gundam surprises the Zeon forces by deploying a 'heatproof film' and surviving to make landfall.
    • Mobile Suit Zeta Gundam also does this to another minor named pilot as a point of character development for Jerid Messa. His friend, Kacricon, had attempted to defeat the Gundam MKII by using Earth's field gravity to his advantage. That didn't go over so well, and with its heat shield is destroyed, his Marasai burned up in the atmosphere.
    • In Mobile Suit Crossbone Gundam, Kincaid manages to survive reentry using a beam shield rather than a physical one, which nobody was sure was even possible. He is still an inch from death afterward and needs immediate medical attention.
    • Kira Yamato is forced to try to re-enter in the Aile Strike as he deployed to defend the Archangel and shuttles shortly before their re-entry. His shield melts up before the Archangel (which deploys a similar heatproof film as the White Base) maneuvers to catch it atop one of its legs. This saves Kira from the worst of it, but he's still cooked inside the Strike and suffers for it once they make planet-side. It's made quite clear he would never have survived if he wasn't a genetically-engineered superhuman.
    • In Mobile Suit Gundam SEED Astray, Lowe and the Red Frame ends up facing this problem when a fight with the Gold Frame sends him hurtling into the gravity well of Earth. His Junk Guild buddies, however, use their ship and the massive amount of junk they gathered as a shield to grab Lowe and ride it out to Earth. They wreck their ship in the process, though.
  • The Macross franchise does deal with the friction of re-entry on occasion.
    • Hikaru's VF-1 get's quite hot and beat-up during its re-entry during the climactic battle.
    • While it does generate a lot of heat the YF-19 shows just how far craft have come in Macross Plus since it not only makes a safe re-entry but it does so completely unpowered and spinning uncontrollably while trying to avoid the orbital defence satellites.
    • Also comes up in the final battle of Macross Frontier Sayonara no Tsubasa when its commented that the Macross Quarter will burn up if they enter the atmosphere at full speed. So they make sure to get behind a large piece of debris to use as a heat shield. Then they proceed to sky surf it.

    Film 
  • Flight of the Navigator: The ship flies up to the edge of the atmosphere and back down again at multi-Mach speed with no heat or friction effects. Justified because of its advanced technology.
  • Aliens. The dropship's entry into the atmosphere of LV-426 apparently causes no heat buildup at all.
  • Averted in two instances in the Star Wars films:
    • Revenge of the Sith has the "not to worry, we are still flying half the ship" incident, wherein they even have firefighting ships swoop in alongside to put out the fires of reentry before Anakin crash-lands.
    • In The Empire Strikes Back, the probe droid sent to Hoth becomes a meteorite.
      • This may be an Invoked Trope (or a case of Fridge Brilliance at least), since EU materials seem to indicate ships normally don't glow on reentry. The logic would be "ships don't glow" → "object glows" → "object is not a ship".
    • See also the Star Wars Expanded Universe examples below.
  • Averted in Serenity. The start of the movie shows the titular ship beginning its reentry, including a brief scare for the crew when an apparently important part randomly breaks off The Alleged Starship.
    Wash: Re-entry is about to get interesting.
    Mal: Define "interesting."
    Wash: (deadpan) 'Oh God, oh God, we're all gonna die!'
  • Inverted (and thus, still wrong) in the first Austin Powers film: Dr Evil's Big Boy rocket begins to reheat the instant it starts to head downwards from orbit.

    Literature 
  • Averted in The Night's Dawn Trilogy by Peter F. Hamilton. During an orbital engagement, one of the mercenary starships grazes the atmosphere to destroy the missiles chasing it, as they're designed for deep space (the starship was also designed for space, but was spherical). Even with being relatively aerodynamic, having internal strengthening forcefields, and only using the upper atmosphere, the ship was nearly destroyed.
  • Star Wars Expanded Universe:
    • In X-Wing: Starfighters of Adumar, it's noted that an X-Wing's shields protect it from reentry. Thus, Wedge can maintain a higher speed on his entry to Adumar's atmosphere than the unshielded Blades escorting him can.
    • During the very first X-Wing book, Corron actually uses a planet's atmosphere to damage a TIE fighter by luring it close enough to the planet during a dogfight to cause reentry heat to begin building up.
    • Other parts of the SWEU, including some books in the same series, use the friction of atmospheric reentry in various ways. Attaching extra hulls to burn up during the descent lets a squadron of X-Wings disguise itself as part of a meteorite shower, letting them infiltrate a hostile world. In the New Jedi Order, the Wraiths have developed single-person reentry pods with ablation shielding for basically the same purpose.
    • In Han Solo at Star's End, the Millennium Falcon uses its shields to offset the heat of entering the atmosphere of Duroon.
    • An aversion in Before the Storm leads to a Red Shirt moment. During a military exercise a fleet tender drops out of hyperspace too late to decelerate and is lost with all hands when it hits a planet's atmosphere.
    • The Corellia trilogy sees a New Republic Intel agent crashing her ship on Corellia, noting as she does so that most ships are designed to survive the heat of a ballistic re-entry - but only once. They're intended to have functional engines to slow them down before they hit the atmosphere.
  • Averted in Use of Weapons. When a Culture module wants to make a swift getaway from a planet's surface, it displaces (teleports) away the air in front of it to behind it as fast as it's moving. It thus makes a multi-mach trip to orbit through a nice, frictionless, self-created vacuum. Of course, The Culture are Sufficiently Advanced Aliens.
  • Averted in Animorphs. The prologue to The Alien shows how Ax wound up on Earth, including an automated reentry by the dome of the Dome Ship GalaxyTree complete with glow from ram pressure. Meanwhile The Andalite Chronicles includes a hypersonic chase through the atmosphere of the Taxxon homeworld, with the ships involved becoming basically self-propelled meteors. Late in the chase, a Bug fighter randomly explodes in midair because its shields failed.
  • Averted in Starship Troopers. The drop pods for infantry have several layers, the first few of which are meant to deal with the friction of being dropped into atmosphere. Johnny is well aware of what could happen if they fail.

    Live Action TV 
  • Averted in Denji Sentai Megaranger and Power Rangers in Space for Rule of Cool. The Cool Starship does its Transformation Sequence into the Megazord in space, then heads down planetside to fight the Monster of the Week. The friction of reentry only means that the Megazord heads into battle wielding a flaming shield.
  • Averted in the Doctor Who story "Voyage of the Damned": The Titanic is glowing when crashing to Earth; however, this is no longer visible when it nearly (or in "Turn Left", actually) hits Buckingham Palace. The Doctor even uses the friction of re-entry to reignite the Titanic's engines.
  • If reentry is actually shown in the Stargate Verse, the trope is usually averted. This is used to the heroes' advantage in the Stargate SG-1 episodes "Nemesis" and "Enemies", when they scuttle the Asgard vessel overrun with Replicators by disabling the shields and performing an uncontrolled re-entry.
  • In Stargate Atlantis, the episode "Lifeline" has McKay explains that even with the ZPM powering the shields, too steep a descent during atmospheric re-entry could overtax it and cause the shield to fail, while even with it in place, the incredible turbulence could cause the city to break into a million pieces long before it crashes into the surface.
  • Averted in Battlestar Galactica (Reimagined), where we get to see The Galactica dropping through the atmosphere like a giant superheated rock in one episode as part of an Airstrike Impossible.
  • Generally averted in Firefly. Entering the atmosphere is described as a fairly rough and sometimes dangerous act for the Serenity, though the latter is more due to her state of disrepair than the actual heat of reentry. Wash's talent for piloting and Kaylee's talent for rapidly jury-rigging repairs for failing systems are able to compensate for Mal's lack of talent for making enough money to properly maintain his ship.
    • In the pilot, we see a Reaver ship maneuvering to present its presumably better-shielded side to atmo, and the ship being surrounded by white-hot plasma. ShownTheirWork, indeed.
  • Averted on Babylon 5, particularly in the season 3 finale, when Sheridan commanded the White Star to dive out of orbit into the Shadow capital and detonate two 500 megaton warheads.

    Tabletop Games 
  • You wouldn't normally expect scientific accuracy from Warhammer 40,000, but Space Marine Drop Pods do have to have heat shielding and stabilizer systems to survive reentry.
    • Although played straight with most of the other vehicles, which look about as aerodynamic and shielded as a block of candyfloss and which somehow manage to be SSTO spaceplanes and floating cathedrals. Semi-justified given the advanced materials used in their construction, and because there seems to be one school of thought in Imperial engineering and that thought is "Thrussssssssssssssst!!!".
      • To be fair, all these flying cathedrals were never intended to actually enter atmosphere. They have shuttles and drop pods for that.

    Video Games 
  • A stock ending for Sonic the Hedgehog games is for Sonic to fall to the planet after blowing up a space station. Sonic 2 shows Sonic actually fly to space on the outside of a ship. Sonic Adventure 2 partly corrects the astronomy by making it possible for characters to die if they hit the atmosphere (Eggman even uses it in an attempt to eliminate Sonic). However, the atmosphere's height varies according to how high the platforms above it are.
    • Not really. All that changes is how long until your character appears to enter the atmosphere- and it has to do with how many platforms are below you, in order to give you a chance to return to a lower part of the stage.
  • Averted in Mass Effect 2, in which Shepard is quite badly killed by reentry by him/herself in a space suitnote . Of course, the space suit ensured s/he was intact enough to be rebuilt...
  • Super Mario Galaxy, obviously.
    • Amusingly averted in Mario Kart Wii, where falling off Rainbow Road will result in your character lighting up as they plummet towards the earth, and they'll be smoking when Lakitu returns them to the track.
  • Most of the Kirby games are like this.
  • Averted in Freelancer. Planets have docking rings to guide them safely to the surface and any ship attempting direct entry to a planet will flare up and eventually be destroyed. Of course, it is also an example of Gameplay and Story Integration.
  • Zig-Zagged in Star Trek: Bridge Commander. Moving too close to a planet will cause an orange, fiery halo to appear around your shields - even if your shields are down - until you splat into the planet. No matter how fast you're travelling, though, you'll never burn up or suffer damage unless you actually hit the planet. Given that planets in this sector are about 200km in diameter, they don't have very thick atmospheres.
  • Averted in Star Trek Klingon Academy. Although flying slowly through a planet's atmosphere provides good camouflage, plowing ahead in your Bird of Prey at high impulse without shields is an excellent way to become a meteor and fail your mission.
  • Halo averts it. Drop Pods and escape pods burn up on re-entry as one would expect, while Pelicans don't reenter fast enough to start heating up.
  • Frontier: First Encounters got it averted, in that a manual landing requires to keep an eye on approach velocity and either your ship has Atmospheric Shielding installed (and it's tough enough to work as armor) or the next reentry will end rather prematurely and spectacularly.
  • Averted in the X-Universe series. Any planets shown aren't backdrops, but actual physical objects with atmospheres, and you can reach them in a ship provided they're not on the opposite side of the Invisible Wall surrounding the sector. (It usually takes forever, though.) Like Freelancer above, objects in the X series aren't designed for atmospheric flight and will burn up. The planet in the sector Split Fire in X3: Terran Conflict has gotten notoriety for this, since its atmosphere starts about a kilometer behind one of the jumpgates, which is normally prime real estate for player-owned factories.
  • As of version 0.23.5, Kerbal Space Program only averts the trope visually, as there are graphical reentry effects (and sonic boom funnels), but they have no practical effect on the craft. There are plans to add actual reentry effects to the game in future updates, and there are mods available that do the same.
  • Averted in Asura's Wrath. The main characters first death was by atmoshperic reentry. It happens to him again later but survives this time.
  • Surprisingly, Orbiter plays this halfway straight, despite being very realistic in most respects. There's friction on reentry (enough to bounce you back out of the atmosphere if you enter at the wrong angle) and a visual effect to show heating, but it's impossible to destroy a ship this way. A few modded vehicles avert this trope.
  • Averted in XenoSaga. At the end of Disc 1, the protagonists enters the atmosphere of a planet on what is essentially a glorified cruise liner. It takes the hidden powers of two of the cast to successfully protect the ship from the heat of reentry. Arguably played with, as some dialogue indicates the ship may have been fine had it entered the atmosphere under more orderly circumstances.

    Webcomics 
  • Averted in Starslip when a recurring antagonist gets blown out an airlock by Vanderbeam, who was sick of the antagonist's recurrences: [1]
  • Averted and discussed in Freefall.
  • Most HSD spaceships in Rank Amateur are designed to be aerodynamic so they can aerobrake without getting damaged. Human/Earth Authority ships are either designed either with landing capability or to never enter atmospheres. The latter type would burn up on atmospheric entry.

    Western Animation 
  • Futurama, unusually for a comedy series, does this right: When Bender the robot falls to Earth from space, he's hot enough to instantly melt snow several meters away. Justified since he's made of Dolemite, which incredibly heat resistant and tough. Bender is made of just enough that he can swim around in magma from the Earth's core for short periods and only be somewhat negatively affected.
  • The less said about the Professor's wooden spaceship that takes the Castaways to Gilligan's Planet the better.
  • Averted in the ''Cars Toon'' "Moon Mater", which is about Mater becoming a moon rover as part of a moon mission to rescue an "autonaut" named Impala XIII, who was trapped inside a crater on the Moon. On the way back to Earth, Mater (while narrating) actually adds his friend Lightning McQueen into his story, since McQueen thinks that Mater is making things up. Lightning McQueen is portrayed here as a reentry probe, and as he is heading back toward Earth, his body starts to heat up rapidly because of friction, and as a result he start screaming "Ow! Hot! Hot! Hot! Hot! Hot!" before finally landing in the ocean and sighing in relief.


Explosive DecompressionSpace Does Not Work That WayGravity Sucks
Friction BurnHollywood ScienceHollywood Acid

alternative title(s): No Kind Of Atmosphere
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