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Planets and moons by size

Order by diameter, smallest first. You place all 19 cards in the right order, one at a time. You start with three lives, and ten right in a row wins a lost one back.

Planets and moons by size
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Order by diameter, smallest first. Drag or tap it onto the line
World
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World
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19
Cards
3
Lives per run
size
Ordered by
Cards only
Card reveal

How the planets and moons size ranking game works

Each card is a world in our solar system: a planet, a dwarf planet, a moon, or the Sun itself. The line underneath tells you what it orbits. You rank them by mean diameter in kilometers, smallest first, using NASA figures. One world starts on the line with its diameter showing. Pick a gap for each new card. Place it correctly and its size is revealed; place it wrongly and it still settles into its real spot, but one of your three lives is gone.

The range runs from lumpy little moons you could drive across in an afternoon to the Sun, which dwarfs everything else in the deck. Some moons are bigger than you might guess, and some planets and dwarf planets are smaller. Being famous has nothing to do with size, and neither does how bright something looks in the night sky. Think about which worlds you have seen drawn side by side, and remember that the giant planets are in a league of their own.

What's in the deck

Here are 19 of the 19 cards you might be dealt. Their values stay hidden until you place them.

  • Deimos Moon of Mars
  • Phobos Moon of Mars
  • Amalthea Moon of Jupiter
  • Phoebe Moon of Saturn
  • Hyperion Moon of Saturn
  • Mimas Moon of Saturn
  • Enceladus Moon of Saturn
  • Ceres Dwarf planet, orbits the Sun
  • Charon Moon of Pluto
  • Titania Moon of Uranus
  • Pluto Dwarf planet, orbits the Sun
  • The Moon Moon of Earth
  • Mercury Planet, orbits the Sun
  • Mars Planet, orbits the Sun
  • Earth Planet, orbits the Sun
  • Neptune Planet, orbits the Sun
  • Saturn Planet, orbits the Sun
  • Jupiter Planet, orbits the Sun
  • The Sun Our star

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