Picture credits
For the pictures in Wondria's Explore topics. Last updated: 12 October 2026
Each Explore topic in Wondria has one picture. They are photographs and illustrations shared by their authors under open licences, or in the public domain, and found on Wikimedia Commons. Wondria staff chose each one. We store them with the app, so a child's device never fetches them from anywhere else.
We are grateful to the people who made them. Each picture's author and licence are also shown under it in the app. We have resized every picture, and the app shows each one cropped to fit its frame. Where we changed a picture in any other way, the table says so. No author or licensor endorses Wondria.
Where a picture is licensed CC BY-SA, our resized copy is shared under that same licence. Public domain pictures need no credit, and we credit them anyway.
Illustrations on the Wondria website
The planets, Mars and family scenes, the 3D icons, the picture of Mars in the Explore example and the poses of Spark on the Wondria home page were made with an AI image tool. Wondria staff chose them. They are illustrations, not photographs, and they do not show real places or people.
| Topic | Picture | Author | Licence | Source | Changes |
|---|---|---|---|---|---|
| Could people live on Mars? | NASA’s Curiosity Views a Sand-Capped Butte (PIA26730).png | NASA/JPL-Caltech/MSSS | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How big is the Sun? | SDO AIA Full-Disk View of Launching Filament (4540790187).jpg | NASA Goddard Space Flight Center | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do 3D printers work? | 3D printing of face shields.jpg | Jan Beránek | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do bats find their way in the dark? | Bat cave in El Maviri Sinaloa - Mexico.jpg | Tomascastelazo | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do bees make honey? | Apis mellifera carnica worker honeycomb 2.jpg | Richard Bartz and Hubert Seibring | CC BY-SA 2.5 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do boats float? | Luciana visiting Lysekil 1.jpg | W.carter | CC0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do bridges stay up? | Clifton Suspension Bridge Bristol.jpg | Lacu Schienred | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do computers store things? | Hard disk head crash.jpg | Alchemist-hp | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do lifts work? | Elevator motor in machine room.jpg | Darklanlan | CC BY 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do magnets work? | Horseshoe magnet metal shavings.jpg | Maciej J. Mrowinski | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do our lungs work? | 3D Medical Animation Diaphragm Structure.jpg | Scientific Animations | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do penguins keep warm? | Penguin in Antarctica jumping out of the water.jpg | Christopher Michel | CC BY 2.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do planes fly? | Lufthansa A320, D-AIZH , Frankfurt (P1033451).jpg | Matti Blume | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do plants make food? | Taro leaf underside, backlit by sun - edit.jpg | Avenue | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do rivers form? | Skagit River 8667s.JPG | Walter Siegmund | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do robots sense things? | Sensor Robot & Servo (26101281843).jpg | BxHxTxCx | CC BY-SA 2.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do seeds grow into plants? | Vrucht van een paardenkastanje (Aesculus) 01-03-2024 (d.j.b.).jpg | Dominicus Johannes Bergsma | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do we taste food? | Zitronenscheiben -- 2025 -- 7302.jpg | Dietmar Rabich | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How do whales breathe? | Blow of a blue whale in the Arctic sea.jpg | AWeith | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does a bicycle work? | Raleigh lady's loop frame bicycle 1930s.jpg | DeFacto | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does a caterpillar become a butterfly? | Monarch caterpillar (23229).jpg | Rhododendrites | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does a fridge keep food cold? | Vestel, IFA 2018, Berlin (P1070201).jpg | Matti Blume | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does a satnav know where you are? | Navstar-2F.jpg | USAF | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does a touchscreen work? | Touch on Clamshell Devices.jpg | Intel Free Press | CC BY 2.0 | Wikimedia Commons | Cropped at the right edge to leave out a background poster. |
| How does the internet work? | Wikimedia Foundation Servers-8055 35.jpg | Victor Grigas | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| How does your heart work? | Human Heart and Circulatory System.png | Bryan Brandenburg | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| The Great Fire of London | Verschuier-fire.jpg | Lieve Verschuier | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| The Romans in Britain | Hadrian's Wall on Housesteads Crags - 06.jpg | Benjamin Smith | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What is a black hole? | Black hole - Messier 87.jpg | Event Horizon Telescope | CC BY 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What is electricity? | Raitersaich SK DSC 0028.jpg | Simon Koopmann | CC BY-SA 3.0 de | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What is sound? | 2016 Kolumny głośnikowe ZG 40-8.jpg | Jacek Halicki | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What is the Moon made of? | LRO Tycho Central Peak.jpg | NASA/GSFC/Arizona State University | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What makes a rainbow? | Väimela Alajärv 2012 08.jpg | Vaido Otsar | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| What was life like for Victorian children? | 19th century classroom, Auckland - 0767.jpg | Jorge Royan | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Where does rain come from? | Rain over Beinn Eich, Luss Hills, Scotland.jpg | Michal Klajban | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Who built the pyramids? | All Gizah Pyramids.jpg | Ricardo Liberato | CC BY-SA 2.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Who was Mary Anning? | Hul - Temnodontosaurus platyodon - 8.jpg | Emőke Dénes | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Who were the Vikings? | Viking Ship Museum - Oseberg ship - 1.jpg | Vassia Atanassova - Spiritia | CC BY-SA 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do earthquakes happen? | Kluft-photo-Carrizo-Plain-Nov-2007-Img 0327.jpg | Ikluft | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do leaves change colour in autumn? | Red aspen leaves by Myrstigen 1.jpg | W.carter | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do stars explode? | Ic443 nf c shorgb 2218m+823m+666m+729m 2218m 37h.jpg | Ram samudrala | CC BY 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do volcanoes erupt? | Fimmvorduhals 2010 03 27 dawn.jpg | Boaworm | CC BY 3.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do we have bones? | Bones of skeletal system.jpg | Scientific Animations | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do we need sleep? | Crescent Moon at night (brammer 9827).jpg | ESO/G. Brammer | CC BY 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do we need to drink water? | Person pours water from a bottle into a glass in a kitchen.jpg | Shixart1985 | CC BY 2.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why do zebras have stripes? | Burchell's zebra (Equus quagga burchellii) 2.jpg | Charles J. Sharp | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why does the Moon change shape? | 1660 celestial chart showing the selenographic phases of the moon.jpg | Andreas Cellarius | Public domain | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |
| Why is the sky blue? | Cirrus uncinus clouds in the morning sky.jpg | ADARSHluck | CC BY-SA 4.0 | Wikimedia Commons | Resized to 1280px wide; shown cropped to fit its frame. |