Largest Objects in the Solar System Quiz

How well do you know the largest objects 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.

▶ Play this quiz
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 solar System round, four more lists keep the ride going.

Show the full ranking (31)

Sun 695,700 km radius
Its light takes about 8 minutes and 20 seconds to reach Earth.
Jupiter 69,886 km radius
Its Great Red Spot, a giant storm, is larger than the whole Earth.
Saturn 58,232 km radius
It is the only planet in the Solar System that is less dense than water.
Uranus 25,362 km radius
Its spin axis is tilted about 98 degrees, so it rolls around the Sun on its side.
Neptune 24,622 km radius
Its position was worked out with mathematics before astronomers first saw it in 1846.
Earth 6,371 km radius
It is the densest planet in the Solar System.
Venus 6,052 km radius
A day on Venus (243 Earth days) lasts longer than its year (225 Earth days).
Mars 3,390 km radius
Its volcano Olympus Mons is about 21.9 km tall, roughly two and a half times Everest.
Ganymede 2,632 km radius
Galileo Galilei and Simon Marius both spotted it in 1610.
Titan 2,575 km radius
It has lakes and seas of liquid methane and ethane on its surface.
Mercury 2,439 km radius
A year on Mercury lasts just 88 Earth days.
Callisto 2,410 km radius
Its surface is the oldest and most heavily cratered in the Solar System.
Io 1,824 km radius
Some of its volcanoes blast plumes of sulfur up to 500 km above the surface.
Moon 1,737 km radius
It drifts about 38 mm farther from Earth each year, about as fast as fingernails grow.
Europa 1,561 km radius
The ocean under its ice may hold two to three times as much water as Earth's oceans.
Triton 1,353 km radius
Voyager 2 saw geyser-like plumes on it in 1989, rising up to 8 km high.
Pluto 1,188 km radius
It was classed as a planet until 2006, when the IAU redefined the word planet.
Eris 1,163 km radius
It is named after the Greek goddess of strife and discord.
Titania 788 km radius
Its biggest canyon, Messina Chasma, runs about 1,500 km from the equator almost to the south pole.
Haumea 772 km radius
It spins once every 3.9 hours, which has stretched it into an elongated shape.
Rhea 764 km radius
In 2010 NASA found it has a very thin atmosphere of oxygen and carbon dioxide.
Oberon 761 km radius
It is the outermost of Uranus's major moons.
Iapetus 734 km radius
Its leading side is dark and its trailing side bright, giving it a striking two-tone look.
Makemake 715 km radius
It is named after the creator god of the Rapa Nui people of Easter Island.
Gonggong 615 km radius
It is named after a Chinese water god with red hair and a serpent's tail.
Charon 606 km radius
It is so big next to Pluto that their shared center of gravity lies outside Pluto.
Umbriel 582 km radius
Its surface is the darkest of all Uranus's large moons.
Ariel 579 km radius
It's named after a spirit in Shakespeare's The Tempest and a sylph in Pope's The Rape of the Lock.
Dione 561 km radius
It shares its orbit with two tiny moons, Helene and Polydeuces.
Quaoar 549 km radius
It has two thin rings that orbit farther out than theory said rings could survive.
Tethys 531 km radius
Its giant Odysseus crater is about 450 km wide, nearly two-fifths of the moon's own width.

Source: Wikipedia: List of Solar System objects by size · as of 2026-11

More quizzes

Brightest stars in the night sky · Largest constellations in the sky · Chemical elements, by atomic number · Largest moons in the Solar System · All quizzes ▸

A new ride every day

Floored is a free daily ranking game: five lists, five target floors, same puzzle for everyone. Play today's ride ▸