Planets, moons and stars

Start on Earth. End up past Pluto.

A calm puzzle app for kids aged 3 to 13. Drag each planet, moon and spacecraft to its place, hear its name, and learn the little story that makes it stick.

Get the appSee the 20 extras

Every space map is free. Try every extra free for 7 days. No ads, no accounts, works offline.

The Space Wiki app: the Solar System map, half filled, with Jupiter waiting to be dragged.
The Solar System, half done

The space maps are free. All of them.

94 planets, moons, Moon seas, Mars places, star patterns and spacecraft on seven maps. Not a taster that stops after round one: every map, free for good.

Solar SystemMoonsSmall worldsThe MoonMarsConstellationsSpacecraft
  1. Pick a mapThe most famous things come first, so round one always feels doable.
  2. Drag it to its placeThe name is said out loud, so kids who can't read yet can play on their own.
  3. Missed? Hear the storyA wrong drop is never a fail. Space Wiki says what that was, then tells the story of the right one.

Eight planets, eight stories

Every planet, moon and spacecraft comes with one short, true story, written for kids and checked against NASA's facts.

MercuryThe smallest planet and the closest to the Sun. A year here lasts only 88 days.
VenusThe hottest planet of all, wrapped in thick yellow clouds. It spins backwards, so the Sun rises in the west.
EarthOur home. The only place we know that has life, and most of it is covered by oceans.
MarsThe red planet. Its red colour is rust in the dust, and it has the tallest volcano we know.
JupiterThe biggest planet. Its Great Red Spot is a storm wider than Earth that has blown for more than 150 years.
SaturnThe planet with the great rings. They are made of billions of pieces of ice and rock.
UranusIt rolls around the Sun tipped over on its side, like a ball.
NeptuneThe farthest planet, deep blue and very cold. It has the fastest winds in the solar system.

Space Wiki Pro: 20 extras

When the maps are full, space gets bigger. One payment opens all twenty, plus everything we add later. Try them all free for 7 days first.

€9.99, paid once

Explore deeper

Famous starsDrag each bright star to its constellation.
Space passportA stamp and a fact card for everything you have found.
Shadow detectiveGuess the spacecraft or world from its shadow.
Line them upPut planets, moons and spacecraft in the right order.
Space tripHow long would it take by car, by plane or by rocket?
True sizePut worlds side by side and see how big they really are.
Moon tonightWhat does the Moon look like today, and next week?
Sky wordsMoon and star in 38 languages.
What's from whereRings, volcanoes and footprints: put them on the right world.

Play & quiz

Surprise trivia10 quick questions and a family leaderboard.
Space twinsWorlds that look almost the same. Can you tell?
Tricky onesThe ones you miss come back until they stick.
Riddle huntClues, one at a time. Who am I?
Sibling duelTwo players, one tablet. Fastest finger wins.
Planet builderRebuild a real planet, or design your own.
Colouring bookColour the Moon, Mars and a rocket with your finger.

Family & calm

Kid profilesUp to 6 kids, each with their own progress.
Grown-up cornerWhat each kid knows, and a certificate.
Our family in spaceHow old would everyone be on Mars or on Jupiter?
BedtimeOne calm space story before sleep.
Screenshot of the Space Wiki app: Jupiter is 11 times as wide as Earth
Jupiter is 11 times as wide as Earth
Screenshot of the Space Wiki app: What the Moon looks like tonight
What the Moon looks like tonight
Screenshot of the Space Wiki app: Find the famous stars
Find the famous stars
Screenshot of the Space Wiki app: A stamp for everything you find
A stamp for everything you find
Screenshot of the Space Wiki app: Two players, one tablet
Two players, one tablet
Screenshot of the Space Wiki app: How old would you be on Mars?
How old would you be on Mars?

Why an app, and why this one

Kids learn by doing

Every drag is a small memory test: find it, place it, see if it was right. Pulling an answer out of your own head is called retrieval practice, and it beats reading the same thing again, also with kids in real primary school classes.1

Pictures stay, words slip

Every world comes with a tiny story kids can see in their head. People remember pictures far better than plain words, so a picture-story sticks where a list of facts doesn't.2

No ads, ever

A University of Michigan study found ads in 95% of 135 popular apps for children aged 5 and under. Space Wiki has none, and no tricks to keep kids hooked.3

Facts that hold up

Sizes, distances and years come from NASA's planetary fact sheets. Space keeps surprising us, so when scientists find something new, we update it.4

Calm enough for a 3 year old. Hard enough for a 13 year old.

Made for kids who learn in their own way, including kids with ADHD.

Short roundsSix things, then a little party. Short enough to finish.
No timers, no losingNo lives and no scores that drop. Every round ends with a fuller map.
Help is one tap awayThe lightbulb makes the right place glow. After two misses it names what is next to it too.
A level for every kidBig targets for the littlest ones, maps without outlines for the experts.
  1. Retrieval practice in primary schools: PMC12372469
  2. Pictures and dual coding (Paivio): The Learning Scientists
  3. Advertising in kids' apps, Meyer et al.: Michigan Medicine
  4. NASA planetary fact sheets: NASA NSSDCA

Get Space Wiki

Free to play. Pro is €9.99, once, after a 7-day free trial.

  • Free: all seven space maps with 94 things to find
  • Pro: all 20 extras and everything we add later
  • No subscription, no ads, nothing else to buy
Coming soon to Google PlayComing soon to the App Store

For grown-ups

  • No ads and no tracking. Ever.
  • No accounts. A kid profile is just a first name, kept on your own device.
  • A grown-up check comes first, so kids never see legal text or a buy button.
  • Works offline. In the car, on a plane, at grandma's.
  • Short, true space stories written for kids, with nothing scary in them.