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File:Solar system 4607.gif

Not quite how our solar system is arranged.

Ah, fictional astronomy. The really great thing about writing is you get to make the entire Cosmos do what you want it to, even things it can't really do. Here are some shortcuts writers take related to astronomy:

These overlap Artistic License Physics and Space Does Not Work That Way.

Unclassified Examples

Can't figure out where to put your astronomy related example? Leave it here. When we get enough like it, a new trope will begin to form. Kind of like a solar system, if you think about it.

Mangled Celestial Motion - Relative Planetary and stellar placement

  • There is an energy snack commercial where a basketball player (Lamar Odom) shows off his ability to dunk to the Moon. On his way, he tells Saturn to get out of his way. If we're suspending our disbelief enough to buy that a guy jump to the Moon, Saturn might as well be between the Earth and the Moon. The next guy says he's going to dunk on Pluto. Okay. For all we know, that might be a shorter trip than one to the Moon, in this Ficton's astronomy.
  • In Lara Croft Tomb Raider, all the planets including Pluto (which at the time, was a planet) are aligned. Okay. Pluto's orbit is highly erratic, tilted at an angle of 17 degrees to the ecliptic and highly eccentric (being the wrong kind of ellipse). It will probably never align closely with all the other planets in the lifespan of the solar system, but you can't have a really good planetary collection without having the whole set.
  • Doctor Who: The 1996 TV movie places Gallifrey, the Doctor's home planet, some 250 million light years away from Earth, on "the other side" of the Milky Way. That's about 249.9 million light years past the other edge of it. The Milky Way is estimated to be only between 80 and 100 thousand light years across.
  • Towards the end of J. K. Rowling's Harry Potter, in mid or late June, Harry is taking his astronomy O.W.L. and charting Orion. Orion is not visible in the night sky in mid or late June at any latitude. The same scene also has him looking around for Venus (which is never more than 47 degrees away from the sun) around midnight. Needless to say, he didn't do particularly well on that O.W.L.. Just as well. Muggles have to be better at something.

Mangled Celestial Motion - Made-To-Order Eclipses

  • Apocalypto features a solar eclipse. The very next night, there's a full moon, which is odd considering that an eclipse can only happen at a new moon. The Moon is obviously like a great big lightbulb a writer can turn up or down, depending on the level of light needed at night.
  • Buffy the Vampire Slayer: The Season 3 finale features a solar eclipse that goes from zero to total in about five seconds, then stays that way for the duration of the entire climactic battle. Apparently the mayor's magic is powerful enough to first speed up the earth's rotation, then stop it dead in its tracks for a while.
  • Ladyhawke: A full moon is followed a few days later by a solar eclipse, followed a few days later by a quarter moon. It is almost like this story about people turning into hawks just wasn't about correct astronomy at all.
  • Something alike happens in the Spanish TV series Aguila Roja. A few days before a full moon there's a solar eclipse.
  • Heroes has issues with eclipses. The pilot has a reasonably brief eclipse, but it's visible in both New York City and Tokyo at the same time. The eclipse that robs everyone of their powers in Season 3 is even worse; not only is it visible across the globe, it lasts for hours. Why? Because is it says so, right here in the script, that's why.

Mangled Celestial Motion - Constellations Are Constant

  • Stargate: The way that constellations are used as a Cartesian coordinate system begins with the idea that a constellation is a fixed point in space. That probably makes it easier to build things you can just walk through to cross interstellar distances.
  • Subverted in Stargate SG-1. The SGC cannot dial any address other than Abydos until Daniel Jackson discovers information that shows how to shift gate addresses to compensate for passing time.
  • Space Mutiny: Constellations are repeatedly referred to as meaningful divisions of space.
  • In Doctor Who, the Doctor specifically mentions that his homeworld of Gallifrey was located in the Kasterborous constellation. How can one's own homeworld be in a constellation, when constellations are arbitrary shapes in the night sky as visible from your homeworld? We can't say that Earth is in a certain constellation because to us constellations are only visible from here.
    • This error also crops up in The Five Star Stories, with many characters referring to the eponymous stars as a constellation despite living on planets orbiting them. They may just be talking poetically, though.
  • Star Control 2: All the stars in a constellation are close to each other in real space, forming contiguous regions.
    • May be justified in that the stars we see in the hyperspace map are those that can be visited for whatever reasons (the most obvious to have planets, they're not binary/multiple systems, etc), having nothing to see with the stars that can be visible from Earth and that the nomenclature used there also does not have nothing to see with the one used by astronomers back on Earth (after all, the real Alpha Centauri is very different of the one of the game.)
  • Shot down in Men in Black, where the cryptic clue "The galaxy is on Orion's belt," is quickly dismissed as blathering nonsense.

Mangled Celestial Motion - Spacey Schedule Errors

  • In She Wolf of London, Randi tells Ian not to worry about her transforming into here wolf form because "there won't be another full moon for months".
  • In Time Scout, reading stars like a clock is portrayed as much more difficult and complex than it actually is.

Mangled Astrophysics - Timescales of Stellar Evolution

  • In the novellization of Revenge of the Sith, Anakin recalls a visit to a black dwarf star system: a frigid dwarf of hypercompacted trace metals, hovering a quantum fraction of a degree above absolute zero. Even now there are no such objects yet, since they require tens of billions of years to cool, and the Universe isn't old enough; and Anakin lived "a long time ago", that's in a universe even younger than ours.
    • As if anyone ever pays attention to the "long time ago" part anyway. Or if they do, it's easily resolved as being "a long time ago" from the perspective of the narrator.

Mangled Astrophysics - Supernovae: Causes and Effects

  • In A Swiftly Tilting Planet, one of the sequels to A Wrinkle in Time, we learn yet another reason not to throw a nuclear war on Earth:

 Gaudior: You know some of the possibilities if your planet is blown up.

Charles Wallace: It just might throw off the balance of things, so that the sun would burst into a supernova.

    • Well, in fairness, in the previous book we had the whole of the planet depending on the survival or death of Charles Wallace, and his entire survival or death dependent on events in one mitochondrion. And no reason for this was given except 'the balance'. So this might just as well be some sort of mystical thing that's insufficiently explained. The idea that the Sun could supernova at all, though...
      • The books work heavily on the principle of "all things are connected", and cascading consequences. Also, it's worth noting that in the A Wrinkle in Time series, stars are sentient beings fully capable of committing suicide - for example, out of grief from losing a beloved "daughter" planet full of life.

Telescopes 101

  • In Lara Croft Tomb Raider, Lara Croft observed the alignment of Pluto and Neptune through a telescope in a room full of what looked like 20 floodlights. Of course, if these two had tried to be too dim to see in that situation, Lara would have just kicked their butts. They must have been really trying to be bright little planetary bodies that night out of sheer terror.
  • The first Ad Bumper (indeed very first segment) of this collection of 1984 commercials and ad bumpers shows a ground-based observatory frantically turning to get a view of a UFO. Not only is the UFO in question too close to resolve clearly by the telescope, but observatories can't turn that fast.

Bad Nomenclature

  • In the manga version of Yu-Gi-Oh! GX, the Big Bad summons his most powerful monster--The Supremacy Sun, strongest monster in the Planet Series. Somewhat justified in that said Big Bad grew up in Ancient Egypt--Yu-Gi-Oh!'s Ancient Egypt... and made the Planet Series, himself.
    • This may be a translation issue, actually, given that a lot of things from Japan classify all celestial bodies as "planets" (Super Mario Galaxy comes to mind).
  • In the World Of Darkness World Of Darkness supplement Infinite Macabre, the term "galaxy" is explicitly stated to mean "systems of stars orbiting one another" or "systems of planets orbiting one or more stars." A Lso, they're separated by hundreds of thousands of parsecs at least, millions of parsecs at most. By way of reference, the nearest "galaxy," using the above definition, to our "galaxy, again using the above definition, is the Centauri system, roughly 1.5 parsecs away. Talk about scale problems...

Fake Looking Celestial Bodies

  • In the Star Wars Expanded Universe the planet Bespin is stated by canon to be a gas giant, but is milky-white and stripeless, and generally looks like Venus. Of course, a Venus-like planet is an even better place to put a Cloud City, but it's not a gas giant, even if canon states it to be such.
    • Fridge Logic: Not all gas giants look alike. A gas giant in the habitable zone would have white water clouds. An orange color could be caused by the presence of methane in the atmosphere (airborne methanogenic bacteria?). The planet could lack stripes if it had a slow rotation.
  • This does NOT excuse the dull red color of the gas giant Yavin. It looks like a brown dwarf, not a gas giant.

Nebulas misrepresented

  • The Crab Nebula and the Horsehead Nebula (because of their interesting appearance) were once depicted as being the home address of various aliens. If not, then they were in the neighborhood. These are not very hospitable areas to have a planet. They are actually areas where new stars are born. Also, as with constellations, these nebulae will not retain their appearance to a person travelling in space as opposed to on Earth. So it makes no sense for an alien to say he is from the Horsehead Nebula

Comet Impacts Don't Work That Way

  • Tank Girl. The opening narration says that a comet hit the Earth and somehow got rid of most of the liquid water on Earth (as shown by the dry sea beds), presumably by evaporating it. It also resulted in no rain falling for 11 years. Unless the comet was made of some crazy compounds designed to utterly destroy water molecules, the result of all that water evaporating should have been 1) the entire planet being flash-broiled, and 2) the mother of all greenhouse effects and downpours when all of that water vapor condensed and returned to the ground. The dialog of the Water And Power personnel implies that vast amounts of water are hidden under the desert, but it's even less likely that the comet impact could have caused that.