Science quiz
Planet, dwarf planet or moon?
Eight planets, five dwarf planets and 21 large moons. A name appears and you click what kind of world it is.
- Format
- Sort into groups
- Items
- 34 to sort
- Limit
- 2:00
- Level
- Medium
- Checked
- 2026.10.03
- Items
- 34
- Groups
- 3
- Time limit
- 2:00
- A miss
- Shows the answer, then moves on
- Each world appears in turn. Click its kind, or press its number.
- The groups never move, so the number keys are quick.
- Skip (0) sends a prompt to the back of the queue.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Click whether each world is a planet, a dwarf planet or a moon. The groups appear when you start.
About this quiz
A planet orbits the Sun and has cleared its path of other debris; a dwarf planet orbits the Sun but has not; a moon orbits another world. The moons here are the largest in the solar system.
- Charon orbits the dwarf planet Pluto.
- Titania, Oberon, Umbriel, Ariel and Miranda are the five large moons of Uranus.
- A miss shows what the world is before the next one appears.
Sources
- [1]NASA Jet Propulsion Laboratory. Planetary Physical Parameters.
- [2]NASA Jet Propulsion Laboratory. Planetary Satellite Physical Parameters.
Note on the data. The planets and dwarf planets are those of the JPL table of planetary physical parameters, and the moons are the largest by mean radius in its table of satellite parameters, each with the world that table files it under. Radii, masses, densities, rotation and orbital periods, gravity and escape velocities are the figures in the JPL Solar System Dynamics tables of planetary physical parameters, read on 3 October 2026. The five dwarf planets are the five in that table, which are the five the International Astronomical Union recognises.
Last checked October 3, 2026
More quizzes like this
| No. | Quiz | Section | Format | Items | Added |
|---|---|---|---|---|---|
| 01 | Which planet does this moon orbit? Sort the moons Io, Titan, Triton, Charon: 23 major moons of the solar system, one at a time. Click the world each moon orbits. Two tries per moon. Science / Sort into groups / 23 to sort | Science | Sort into groups | 23 | 2026.10.03 |
| 02 | Solar System Knockout: Size, Mass, Gravity and More Ten worlds from the eight planets and five dwarf planets, nine rounds. Each round names a measure: knock out the highest world still standing. Science / Strongest link / 9 rounds | Science | Strongest link | 9 | 2026.10.03 |
| 03 | Planets and their moons Ten questions on the moons of the solar system: which planets have none, how many Mars has, and which moon is the largest of all. Science / Pick the answer / 10 questions | Science | Pick the answer | 10 | 2026.10.03 |