Random Planet Generator
Fictional worlds for sci-fi and real planets with facts.
Random Planet Generator
The Random Planet Generator creates fictional planets for science fiction, games and worldbuilding, or picks real planets, dwarf planets and exoplanets with a quick fact. A fictional result might read: Velorinis – an ocean world orbiting a red dwarf; dense water vapour, 2 moons, a 340-day year and glowing oceans.
Fictional planets
Every invented planet gets a name and, with details on:
- Type – desert, ocean, ice, lava, jungle, crystal or storm world, gas giant, super-Earth or a city-covered ecumenopolis.
- Star – red dwarf, Sun-like star, blue giant, white dwarf, binary pair or even a pulsar.
- Atmosphere – from breathable air to sulphur clouds, methane haze or pink argon skies.
- Moons and year length – a quick sense of the world's sky and seasons.
- A signature feature – floating mountains, diamond rain, ancient ruins or endless canyons.
Real planets
Switch to Real planet to explore actual worlds: the eight planets of our Solar System, the dwarf planets, and famous exoplanets like the possibly glass-raining HD 189733 b or Kepler-16b, a real-life Tatooine that orbits two stars.
Ideas
Sci-fi writing and tabletop games. Need a destination for the next chapter or session? Roll a planet and let its feature suggest the conflict.
Space-themed classes. Use real mode for "planet of the day" facts or quiz questions.
Game design. Generate a whole star system of planet names and assign biomes.
Drawing. Paint the view from the surface of your random planet.
How to use
Choose Fictional or Real, set the number of planets and press Generate. Turn off Show details for names only. Copy or download the list; nothing leaves your browser.
Frequently Asked Questions
Are the fictional planets scientifically accurate?
They're plausible-sounding rather than simulated. Types like ocean worlds, lava worlds and tidally locked planets all have real counterparts, but the combinations are meant to inspire stories, not pass peer review.
What real planets are included?
The eight planets of the Solar System, five dwarf planets (Pluto, Ceres, Eris, Haumea, Makemake) and a dozen famous exoplanets such as Proxima Centauri b, TRAPPIST-1e and Kepler-16b, each with a short fact.
How do I get a quick list of planet names?
Turn off Show details. In fictional mode you get only invented names – handy for naming the worlds of a star system.
Are the moon counts up to date?
The real planet moon counts follow NASA's published numbers at the time of writing; new moons of the giant planets are still being discovered.