🪐 Themed set
Space: how big are they really?
Planets, moons and the Sun. Brace yourself — space is big.
Unrolling the blueprint…
Real sizes in this set
Spoiler alert — play first! Every item in the space set, smallest to largest.
| Object | Metric | Imperial | Measured |
|---|---|---|---|
| Ceres | 939 km | 583 mi | across |
| Pluto | 2,377 km | 1,477 mi | across |
| Europa | 3,122 km | 1,940 mi | across |
| The Moon | 3,474 km | 2,159 mi | across |
| Mercury | 4,879 km | 3,032 mi | across |
| Titan | 5,150 km | 3,200 mi | across |
| Ganymede | 5,268 km | 3,273 mi | across |
| Mars | 6,779 km | 4,212 mi | across |
| Venus | 12,104 km | 7,521 mi | across |
| Earth | 12,742 km | 7,918 mi | across |
| Neptune | 49,244 km | 30,599 mi | across |
| Uranus | 50,724 km | 31,518 mi | across |
| Jupiter | 139,820 km | 86,880 mi | across |
| Saturn (with rings) | 273,000 km | 169,634 mi | wide |
| The Sun | 1,392,700 km | 865,384 mi | across |
| Sirius A | 2,383,000 km | 1,480,728 mi | across |
Space comparisons
Questions
How does the space size game work?
Each round shows one object at true scale as a solid blue yardstick. Stretch the dashed outline of a space until it looks right, then press Measure to see its real size. Five rounds, up to 15 stars.
What is the largest item in the space set?
Sirius A, at 2,383,000 km (1,480,728 mi) across.
And the smallest?
Ceres, at 939 km (583 mi) across.
Other themes
Animals
From garden ants to blue whales — guess the real size of the animal kingdom.
🗼Landmarks
Skyscrapers, towers, statues and wonders of the world, side by side at true scale.
🚀Vehicles
Cars, buses, jumbo jets, ocean liners and rockets.
🪐Space
Planets, moons and the Sun. Brace yourself — space is big.
🌲Nature
Giant trees, cacti and the highest mountains on Earth.
☕Everyday Objects
Things you hold every day — but do you really know how big they are?
🎻Musical Instruments
Violins, guitars, double basses and concert grand pianos.
⚽Sports
Balls, bats, boards, goals, courts and pools — how well do you know the field of play?
🍕Food
From a single grain of rice to a whole wheel of cheese — sizing up what's on your plate.