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Largest Moons in the Solar System Quiz

How well do you know the largest moons in the Solar System? Floored turns the ranking into a building: floor 1 is the top of the list. We name a floor, you guess what's on it, and the lift rides to whatever you picked so you know to go higher or lower.

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Free, no sign-up · 5 lists, a few minutes

How it works

You get a few guesses per floor. Land it on your first guess for 10 points; a near miss still scores. After the moons round, four more lists keep the ride going.

Show the full ranking (20)
  1. Ganymede 5,265 km
    It is larger than the planet Mercury and has its own magnetic field.
  2. Titan 5,150 km
    It is the only moon known to have a dense atmosphere, thicker than Earth's.
  3. Callisto 4,821 km
    Its surface is almost completely covered with impact craters.
  4. Io 3,648 km
    With over 400 active volcanoes, it is the most geologically active object in the Solar System.
  5. Moon 3,475 km
    It is the only celestial body beyond Earth that humans have visited.
  6. Europa 3,122 km
    A water ocean beneath its icy surface could conceivably harbour life.
  7. Triton 2,707 km
    It orbits backwards, and is thought to be a captured Kuiper belt dwarf planet.
  8. Titania 1,577 km
    Named after the fairy queen in A Midsummer Night's Dream, it was found by William Herschel in 1787.
  9. Rhea 1,528 km
    Giovanni Cassini discovered it on December 23, 1672.
  10. Oberon 1,523 km
    William Herschel discovered it on January 11, 1787.
  11. Iapetus 1,469 km
    It has a striking two-tone colouring and a huge ridge around its equator.
  12. Charon 1,212 km
    It has half the diameter of Pluto, and the two are tidally locked to each other.
  13. Umbriel 1,165 km
    Its battered surface is dark apart from a few bright patches, such as the ring in Wunda crater.
  14. Ariel 1,158 km
    Like all Uranian moons, it is named after a character from Shakespeare or Alexander Pope.
  15. Dione 1,123 km
    Giovanni Cassini discovered it in 1684.
  16. Tethys 1,062 km
    Its Ithaca Chasma canyon is about 100 km wide and more than 2,000 km long.
  17. Dysnomia 616 km
    It was found in 2005 and nicknamed Gabrielle before it got its official name.
  18. Enceladus 504 km
    Geyser-like jets of water vapour shoot out from near its south pole.
  19. Miranda 472 km
    Gerard Kuiper discovered it in 1948.
  20. Vanth 442 km
    It is about half the size of Orcus, the dwarf planet it orbits.

Source: Wikipedia: List of Solar System objects by size · as of 2026-10

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