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Science quiz

The ten largest moons in order

Ten buttons in A to Z order, and every one is in the top ten. Click the largest moon first, then the next, down to number ten.

Format
Click the grid
Items
10 to click
Limit
2:00
Level
Hard
Checked
2026.10.03
Targets
10
Time limit
2:00
Minefield
One wrong click ends it
  • Work out what comes next and click it.
  • The full order is shown when the game ends.
  • Pause whenever you like (Esc). The board hides while the clock is stopped.

Click the moons from largest to smallest. The grid appears when you start.

About this quiz

Seven moons are larger than Pluto, and the two largest are bigger than the planet Mercury. Size here is the mean radius.

  • The largest has a mean radius of 2,631 km; the tenth, 761 km.
  • Just outside the ten: Iapetus, 734 km.
  • Four of the ten orbit Jupiter.
  • After the game every button shows its place in the order.

Sources

  1. [1]NASA Jet Propulsion Laboratory. Planetary Satellite Physical Parameters.

Note on the data. The order is by mean radius in the JPL Solar System Dynamics table of planetary satellite physical parameters, read on 3 October 2026.

Last checked October 3, 2026

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