Random Planet Generator
Eight planets, five dwarf planets, one button. This random planet generator tours the solar system one world at a time, pairing each pick with a fact — from Saturn's bathtub buoyancy to the storm on Jupiter that's older than the United States.
Generate a list of planets
Need more than one? Set how many planets you want (up to 13) and get them in one click, with no repeats within a batch. Then use Copy to take them with you — one per line pastes straight down a spreadsheet column, CSV keeps any extra columns, and the numbered list drops into a doc or a lesson plan.
About This Random Planet Generator
The generator covers all thirteen officially recognized planetary worlds: the four rocky inner planets, the four giant outer planets, and the five dwarf planets (Pluto, Ceres, Eris, Makemake, and Haumea). Every world has an equal chance per click, which gives the often-forgotten dwarf planets the same airtime as the famous eight.
Beyond the Big Eight
The dwarf planets are where the generator earns its keep. Haumea spins so fast it's stretched into an egg. Ceres hides in the asteroid belt with vast stores of water ice beneath its crust. Eris is Pluto's near-twin, orbiting roughly twice as far from the Sun as Pluto on average — and the reason "planet" had to be formally defined at all. Random selection means you'll actually meet them.
All 13 planets
| Name | Details |
|---|---|
| Mercury | The smallest planet and closest to the Sun — yet not the hottest. A year there lasts just 88 Earth days. |
| Venus | The hottest planet at around 870°F, thanks to a runaway greenhouse effect. It spins backwards, so the Sun rises in the west. |
| Earth | The only known world with liquid water oceans on its surface — and the densest planet in the solar system. |
| Mars | Home to Olympus Mons, a volcano nearly three times the height of Mount Everest, and canyon systems that dwarf the Grand Canyon. |
| Jupiter | More massive than all other planets combined. Its Great Red Spot is a storm bigger than Earth that has raged for centuries. |
| Saturn | Its rings are mostly water ice and span 175,000 miles across, yet average only about 30 feet thick. It would float in a big enough bathtub. |
| Uranus | Rolls around the Sun on its side, with its axis tilted 98 degrees — likely knocked over by an ancient collision. |
| Neptune | Has the fastest winds in the solar system at over 1,200 mph, and was discovered by math before it was seen by telescope. |
| Pluto | The most famous dwarf planet. Its heart-shaped nitrogen glacier, Sputnik Planitia, is bigger than Texas. |
| Ceres | The largest object in the asteroid belt and the first dwarf planet ever visited by a spacecraft (Dawn, 2015). |
| Eris | The dwarf planet whose discovery in 2005 triggered the debate that demoted Pluto — it's almost exactly Pluto's size but orbits roughly twice as far from the Sun as Pluto, on average. |
| Makemake | A reddish dwarf planet in the Kuiper Belt, named for the creator god of Easter Island's Rapa Nui people. |
| Haumea | A dwarf planet spinning so fast — one rotation every 4 hours — that it's stretched into an egg shape. |
Frequently Asked Questions
How does the random planet generator work?
Each click picks one of 13 worlds at random — the eight planets plus five officially recognized dwarf planets — with every world equally likely. Each result includes a fact worth remembering.
Does it include Pluto?
Yes! Pluto is included along with the other dwarf planets Ceres, Eris, Makemake, and Haumea. Each is labeled with a fact, including the story of how Eris's discovery led to Pluto's reclassification in 2006.
Are the planet facts scientifically accurate?
Yes — each fact reflects current planetary science, like Venus being hotter than Mercury despite being farther from the Sun, and Neptune's 1,200 mph winds being the fastest in the solar system.
What can I use a random planet for?
Classroom astronomy units, research prompts for students, trivia questions, art and writing prompts, planet-of-the-day features, and settling debates about which world to learn about next.