Image Credits

Lesson imagery comes from Openverse — openly-licensed photos and illustrations from sources like NASA, Wikimedia Commons, museums, and Flickr. We are grateful to the creators below.

• ¥§•ªˆ¨ˇ© LOVE © ˇ¨ˆª•§¥ — CC BY 2.0
• 121 Unbiunium — CC BY-SA 4.0
• A. Pitt-Rivers, book author — Public domain
• Acabashi — CC BY-SA 4.0
• ADKPhoto — CC0 1.0
• After Levina Teerlinc — Public domain
• Aimelaime at French Wikipedia — Public domain
• Akm Knight — CC0
• Al-Biruni — Public domain
• Alaskan Dude — CC BY 2.0
• Albert Bridge — CC BY-SA 2.0
• Alchemist-hp (pse-mendelejew.de). — FAL
• Alexey Kljatov — CC BY 2.0
• Aliva Sahoo — CC BY-SA 4.0
• Aliva Sahoo — CC BY 4.0
• Aliva Sahoo — CC BY 4.0
• Allard Schmidt (The Netherlands) — Public domain
• Anass ERRIHANI — CC BY-SA 4.0
• Andreas Tille — CC BY-SA 3.0
• Anna Benczur — CC BY-SA 4.0
• Annielogue — CC BY-SA 4.0
• Anonymous (Germany)Unknown author — Public domain
• ÅñtóñSûsî (Ð) — CC BY 3.0 de
• Aodhdubh at English Wikipedia — CC BY 2.5
• ArchaiOptix — CC BY-SA 4.0
• Arian Zwegers — CC BY 2.0
• Ariel Waldman from Muncie — CC BY-SA 2.0
• Arifinal0109 — CC BY-SA 4.0
• Arjuno3 — CC BY-SA 4.0
• ArnoldReinhold — CC BY-SA 4.0
• Astronaut David R. Scott, Apollo 15 commander. — Public domain
• Atmospheric Infrared Sounder — CC BY 2.0
• Auckland Museum Collections from Auckland, Aotearoa New Zealand — CC BY 2.0
• avlxyz — CC BY-SA 2.0
• Bamileke — CC BY 3.0
• Basile Morin — CC BY-SA 4.0
• Basile Morin — CC BY-SA 4.0
• Ben Mills — Public domain
• BenHawkinsPhotography — CC BY-SA 4.0
• Bernard DUPONT from FRANCE — CC BY-SA 2.0
• Bernard Gagnon — CC0
• Bernard Spragg — CC0 1.0
• Bharswami — CC0
• Biblioteca Rector Machado y Nuñez — Public Domain
• big-ashb — CC BY 2.0
• BioDivLibrary — CC BY 2.0
• BioKnowlogy — Public Domain
• Boyce Duprey — CC BY 2.0
• Brian Robert Marshall — CC BY-SA 2.0
• Brigban — CC0
• brooklynmuseum — CC BY 3.0
• BruceBlaus. When using this image in external sources it can be cited as: Blause — CC BY-SA 3.0
• Bryant Korzeniewski/NOAA — Public domain
• Bryn Pinzgauer — CC BY 2.0
• Buba NS — CC BY-SA 4.0
• Bureau of Land Management — Public domain
• Buzz Aldrin — Public domain
• CandaceApril — CC BY 2.0
• Canley — CC BY-SA 3.0
• Cbuske46 — CC BY-SA 4.0
• CEphoto, Uwe Aranas — CC BY-SA 3.0
• Cesar Paes Barreto — Copyrighted free use
• César Rincón — CC BY 2.0
• Chief Yeoman Alphonso Braggs, US-Navy — Public domain
• Chinobazaar — CC BY-SA 4.0
• Chris — CC BY-SA 2.0
• Christinelmiller — CC BY-SA 4.0
• Christopher Michel — CC BY-SA 4.0
• clickfarmer — CC BY 2.0
• cmglee, jimht at shaw dot ca — CC BY-SA 4.0
• Colin Walker — CC BY-SA 2.0
• Collins, Tudor Washington, 1898-1970, photographer — CC BY 4.0
• Coppo di Marcovaldo — CC BY-SA 3.0
• Cornelius Fyla — CC BY-SA 4.0
• Cory Doctorow from London, UK — CC BY-SA 2.0
• Courtesy of NIAID Ryan Kissinger — Public domain
• Courtesy of NIAID Ryan Kissinger — Public domain
• Courtesy of NIAID Ryan Kissinger — Public domain
• Crbng — CC0
• Cristian Bortes from Cluj-Napoca, Romania — CC BY 2.0
• crmv — CC0 1.0
• Cruithne9 — CC BY-SA 4.0
• D-Kuru — CC BY-SA 3.0 at
• D-Stanley — CC BY 2.0
• dalecruse — CC BY 2.0
• Damian Gadal — CC BY 2.0
• Danijel Mihajlovic — CC BY-SA 4.0
• David Campbell — Public domain
• David Hawgood — CC BY-SA 2.0
• David Kernan — CC BY 4.0
• David Martin — CC BY-SA 2.0
• DavidGoodsell — CC BY 4.0
• Dean Hochman — CC BY 2.0
• DeFacto — CC BY-SA 4.0
• Demonio Solitario 666 — CC BY-SA 4.0
• denisbin from Adelaide, Australia — CC BY-SA 2.0
• Derek Harper — CC BY-SA 2.0
• Derek Voller — CC BY-SA 2.0
• Diana Ackerman Grunfeld, Daniel Gilbert, Jennifer Hou, Adele M. Jones, Matthew J — CC BY 4.0
• Diego Delso — CC BY-SA 3.0
• Dietmar Rabich — CC BY-SA 4.0
• Diliff — CC BY-SA 2.5
• Doctor Jana — CC BY 4.0
• Dr Mostafa Sadek — CC BY-SA 4.0
• Dr. Johannes Sobotta — Public domain
• Dre Erwin Photography — CC BY-SA 4.0
• Easchiff — CC BY-SA 3.0
• Edeh Sophia — CC0 1.0
• Edwin Ray Lankester, Q. J. Mic. Sci. vol. xxxiv., 1893 — Public domain
• Elliott Brown from Birmingham, United Kingdom — CC BY-SA 2.0
• Ember Studio — CC BY 2.0
• Eric Polk — CC BY-SA 4.0
• ErMED14 — CC BY-SA 4.0
• ESA and the Planck Collaboration — CC BY 4.0
• ESA/Hubble NASA, R. Chandar, J. Lee and the PHANGS-HST team — Public domain
• ESO — CC BY 4.0
• EU — Public domain
• Eurobas — CC BY 3.0
• European Space Agency — CC BY-SA 3.0 igo
• European Space Agency — CC BY-SA 3.0 igo
• European Space Agency — CC BY-SA 3.0 igo
• European Space Agency — CC BY 4.0
• Evelyn Saenz — CC BY 2.0
• Evelyn Simak — CC BY-SA 2.0
• Event Horizon Telescope — CC BY 4.0
• f097653195018 — CC BY-SA 2.0
• Fæ — CC BY-SA 3.0
• Fæ — CC BY 2.0
• Federal Bureau of Investigation — Public domain
• File:Bar magnet.jpg: Photo taken by Aney / derivative work: MikeRun — CC BY-SA 3.0
• Filip Mishevski from Skopje, Macedonia — CC BY 2.0
• Frank Basford, Frank Basford, 2004-09-21 18:19:10 — CC BY-SA 2.0
• freestocks.org — CC0 1.0
• Fumo2022 — CC BY-SA 4.0
• Gary Todd from Xinzheng, China — CC0
• Gary Todd from Xinzheng, China — CC0
• Gary Todd from Xinzheng, China — CC0
• geckzilla — CC BY 2.0
• Gideon Pisanty (Gidip) — CC BY 3.0
• Giles Laurent — CC BY-SA 4.0
• Gilles de Rome — CC BY-SA 4.0
• girolame — CC BY 2.0
• GollyGforce - Living My Worst Nightmare — CC BY 2.0
• GregWelch8 — CC0 1.0
• gunthercox — CC0
• Hakunamenta — CC0 1.0
• Hari K Patibanda — CC BY 2.0
• Hasan Hagi — CC BY 3.0
• Hawker Aircraft Ltd — CC0
• Herbythyme — CC BY-SA 4.0
• Hillers K.J., Jantsch V., Martinez-Perez E., Yanowitz J.L — CC BY 2.5
• hobvias sudoneighm from Seattle, United States of America — CC BY 2.0
• Hool, George A. (George Albert), 1883-; Whitney, Charles Smith, 1892- — No restrictions
• http://www.scholarpedia.org/article/Lattice_quantum_field_theory — CC BY-SA 4.0
• https://openstax.org — CC BY-SA 4.0
• Hubble Space Telescope / ESA — CC BY 2.0
• I would appreciate being notified if you use my work outside Wikimedia. Do not c — CC BY-SA 3.0
• Ian Sane — CC BY 2.0
• Ida Clemens for text and Charles Nicholas for the image — Public domain
• Image Catalog — CC0 1.0
• Image Editor — CC BY 2.0
• Infrogmation of New Orleans — CC BY-SA 4.0
• Ingolfson — Public domain
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Internet Archive Book Images — No restrictions
• Irrational pi (talk) — CC BY-SA 3.0
• Isabelle Weindl, Mario Ost, Petra Wiedmer, Monika Schreiner, Susanne Neugart, Re — CC BY 4.0
• Jacob Riis (1849-1914) — Public domain
• Jacobolus — CC BY-SA 4.0
• Jamain — CC BY-SA 4.0
• James St. John — CC BY 2.0
• James St. John — CC BY 2.0
• James St. John — CC BY 2.0
• James St. John — CC BY 2.0
• Jan Bambach — CC BY-SA 3.0
• Jan van der Heyden — Public domain
• Javier Puig Ochoa — CC BY 3.0
• Jayzlimno — CC BY-SA 4.0
• JC Merriman — CC BY 2.0
• jeffdjevdet — CC BY 2.0
• jimg944 — CC BY 2.0
• JMK — CC BY-SA 3.0
• Joe Mabel (on Flickr as Joe Mabel from Seattle, US) — CC BY-SA 3.0
• John-Morgan — CC BY 2.0
• jonnyabcde — CC BY 2.0
• Jozef020 — CC BY-SA 4.0
• JULIAN MASON from London, UK — CC BY 2.0
• jurvetson — CC BY 2.0
• jurvetson — CC BY 2.0
• jurvetson — CC BY 2.0
• Just-a-can-of-beans — CC BY 4.0
• kallerna — CC BY-SA 4.0
• KariHak — CC BY 2.0
• Ken Lund from Reno, Nevada, USA — CC BY-SA 2.0
• Kevin M. Gill — CC BY 2.0
• KevinDInno — Public domain
• kevinpoh — CC BY 2.0
• kevinpoh — CC BY 2.0
• Kim Siever — Public Domain
• KKPCW — CC BY-SA 4.0
• Komavo — CC BY 4.0
• Krishna k. sahh — CC0
• Kritzolina — Public domain
• Laitche — Public domain
• Lance Cheung — CC BY 2.0
• Lauren Manning — CC BY 2.0
• Ldorfman — CC BY-SA 3.0
• Leonardo da Vinci — Public domain
• Lexlex — CC BY-SA 4.0
• Louis-Philippe Crépin — Public domain
• LoveElectronicLiterature — CC BY-SA 4.0
• lyng883 — CC BY 2.0
• Lystopad — CC BY-SA 4.0
• Maarten Elings — CC BY 2.0
• Madhav fallusion — CC BY-SA 4.0
• Maria Voigt and PDB-101 — CC BY 4.0
• Marianne Casamance — CC BY-SA 3.0
• Mario A. P. from San Sebastian, Spain — CC BY-SA 2.0
• Matson Collection — Public domain
• Matthew T Rader — CC BY-SA 4.0
• Mauro Cateb — CC BY-SA 3.0
• MCAD Library — CC BY 2.0
• McKay Savage from London, UK — CC BY 2.0
• mckaysavage — CC BY 2.0
• Megaurab09 — CC BY-SA 4.0
• Metaloman99 — CC BY-SA 4.0
• Mfe1710 — CC BY-SA 3.0
• Mic-check-one-two at English Wikipedia — Public domain
• Michael Warnock — CC BY 3.0
• mira66 — CC BY 2.0
• Mohamed_A.M._Ahmed — CC BY-SA 4.0
• moonjazz — Public Domain
• Mount Rainier NPS — CC BY 2.0
• Mustang Joe — CC0 1.0
• Muybridge, Eadweard, 1830-1904 — Public domain
• Mx. Granger — CC0
• Nabeel191 — CC BY-SA 4.0
• NASA — Public domain
• NASA — Public domain
• NASA — Public domain
• NASA — Public domain
• NASA — Public domain
• NASA — Public domain
• NASA / Apollo 11 — Public domain
• NASA / JPL / University of Arizona — Public domain
• NASA Armstrong Flight Research Center / NASA/Carla Thomas — Public domain
• NASA Earth Observatory images by Michala Garrison, using Landsat data from the U — Public domain
• NASA ESA — Public domain
• NASA Goddard Photo and Video — CC BY 2.0
• NASA Goddard Photo and Video — CC BY 2.0
• NASA Goddard Space Flight Center — CC BY 2.0
• NASA Goddard Space Flight Center from Greenbelt, MD, USA — Public domain
• NASA Goddard Space Flight Center from Greenbelt, MD, USA — Public domain
• NASA Hubble — CC BY 2.0
• NASA image courtesy Jeff Schmaltz, MODIS Rapid Response at NASA GSFC. — Public domain
• NASA Universe — CC BY 2.0
• NASA, ESA, E. Meyer, W. Sparks, J. Biretta, J. Anderson, S.T. Sohn, and R. van d — CC BY 4.0
• NASA's Scientific Visualization Studio - Science and Technology Corporation/Kel — Public domain
• NASA/Apollo 17 crew; taken by either Harrison Schmitt or Ron Evans — Public domain
• NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team — Public domain
• NASA/JPL-Caltech/ASU/MSSS — Public domain
• NASA/JPL-Caltech/WISE Team — Public domain
• NASA/JPL/Space Science Institute — Public domain
• NASA/MSFC/David Higginbotham/Emmett Given — Public domain
• Natalka Ukraine — CC BY 4.0
• National Aeronautics and Space Administration. Lyndon B. Johnson Space Center. 2 — Public domain
• nenadstojkovicart — CC BY 2.0
• Nessa Eull — CC0
• Nigel Brown — CC BY-SA 2.0
• NIH-NCATS — Public Domain
• NOAA's National Ocean Service — Public Domain
• Norman B. Leventhal Map Center at the BPL — CC BY 2.0
• NPS — Public domain
• O. Adrian Pfiffner — CC BY 4.0
• OpenStax College — CC BY 3.0
• oskaree — CC BY 2.0
• Pacific Southwest Region 5 — Public domain
• PaleoGeekSquared — CC BY-SA 4.0
• Patrick J. Lynch, medical illustrator — CC BY 2.5
• paul bica — CC BY 2.0
• Pavithra mallan — CC0
• Pearson Scott Foresman — Public domain
• Petar Milošević — CC BY-SA 4.0
• Peter Kaminski — CC BY 2.0
• Photo by and (c)2007 Derek Ramsey (Ram-Man) — GFDL 1.2
• Photo credit: Jon A. Morse (STScI) and NASA Investigating team: William P. Blair — Public domain
• Photogir — CC BY-SA 4.0
• Pierre André Leclercq — Public domain
• Pierre Markuse — CC BY 2.0
• Post of Indonesia — Public domain
• Produced By: JPL, Image Credit: NASA/JPL/University of Michigan/UCLA — Public domain
• productie van de afbeelding uit het .shp-bestand: Koenb at Dutch Wikipedia — Public domain
• Queensland State Archives — Public Domain
• Queensland State Archives — Public Domain
• Quinn Dombrowski (quinn.anya) https://www.flickr.com/people/quinnanya/ — CC BY-SA 2.0
• Quist161 — CC BY-SA 4.0
• Rado bladteth Rzeznicki — Public domain
• Rajneesh kumar Thakur — CC BY-SA 4.0
• Rama — CC BY-SA 2.0 fr
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• rawpixel — CC0 1.0
• RCraig09 — CC BY-SA 4.0
• Rene Schwietzke — CC BY 2.0
• Richard Leonard — CC BY 2.0
• Rick Fairhurst and Jordan Zuspann, National Institute of Allergy and Infectious — Public domain
• Rob Walrecht — CC BY-SA 4.0
• Rod Waddington — CC BY-SA 2.0
• Ron Cogswell — CC BY 2.0
• Rubin Observatory/NOIRLab/NSF/AURA/H. Stockebrand — CC BY 4.0
• rudykokich — Public Domain
• Ruth and Dave — CC BY 2.0
• sanchezn — CC BY-SA 3.0
• Scarabinol — CC BY 4.0
• SCB2024 — CC0
• Schmidt Botley; Henry G. Gilbert Nursery and Seed Trade Catalog Collection — No restrictions
• Sebastian Herndlhofer — CC BY-SA 4.0
• Serge Yerin (YeS) — CC BY 4.0
• Sergei Kazantsev — CC BY-SA 4.0
• Shiv's fotografia — CC BY-SA 4.0
• Shiv's fotografia — CC BY-SA 4.0
• Shixart1985 — CC BY 2.0
• Shixart1985 — CC BY 2.0
• Signal Corps Archive — Public Domain
• Sirkfish — CC BY-SA 4.0
• Snapdragon66 — CC BY-SA 4.0
• soapylovedeb — CC BY 2.0
• Sonse — CC BY 2.0
• South African Tourism from South Africa — CC BY 2.0
• Sparrow (麻雀) — CC BY-SA 4.0
• spunecker — CC BY 2.0
• Staff Sgt. Nathan Hoskins — Public domain
• Stanislav Stelmakhovich — CC0
• Stephen Richards — CC BY-SA 2.0
• Steve Cadman — CC BY-SA 2.0
• Steve Jurvetson from Los Altos, USA — CC BY 2.0
• StromBer — CC BY-SA 3.0
• Struthious Bandersnatch — CC BY-SA 3.0
• Sumandas1998rik — CC BY-SA 4.0
• SuSanA Secretariat — CC BY 2.0
• Suzelfe — CC BY-SA 4.0
• Taavi Niittee — CC BY-SA 4.0
• Taylor 49 — CC BY-SA 4.0
• Tdadamemd — CC BY-SA 3.0
• Terry Debruyne, U.S. Fish and Wildlife Service — Public domain
• The British Library — No restrictions
• The government of the People's Republic of Mongolia. — Public domain
• The Library of Congress — No restrictions
• The original uploader was Njan at English Wikipedia. (Original text: James Eaton — CC BY-SA 3.0
• The Portable Antiquities Scheme, Frank Basford, 2015-09-02 12:10:56 — CC BY 2.0
• TheresNothingOutThere — CC BY-SA 4.0
• Thomas Fisher Rare Book Library, UofT — CC BY 2.0
• Thomas Kitchin — Public domain
• Thomas Nugent — CC BY-SA 2.0
• Tilonaut — CC BY 3.0
• Tobyotter — CC BY 2.0
• Tolnai - korabeli képek alapján — Public domain
• Tomascastelazo — CC BY-SA 3.0
• topgold — CC BY 2.0
• translation w:sk:user:Adrian — Public domain
• U. S. Fish and Wildlife Service - Northeast Region — Public Domain
• U.S. Army USAG-V by Cristina Piosa — Public domain
• U.S. Geological Survey — CC BY 2.0
• Unknown artistUnknown artist — Public domain
• Unknown authorUnknown author — CC0
• Unknown authorUnknown author — Public domain
• Unknown authorUnknown author or not provided — Public domain
• Unknown Illustrator — Public domain
• Unknown photographer — Public domain
• Unknown, Franco-Flemish — CC0 1.0
• Unknown; film released by Cannon Pictures — Public domain
• USAG-Humphreys — CC BY 2.0
• USDA NRCS South Dakota — Public domain
• USDOE — Public domain
• User:Steven Walling — CC BY-SA 3.0
• USFWSAlaska — Public domain
• vastateparksstaff — CC BY 2.0
• Victoria C — CC BY-SA 4.0
• Vincent van Gogh — Public domain
• Vinny255 — CC BY-SA 4.0
• Vive la Rosière — CC0 1.0
• Vyacheslav Argenberg — CC BY 4.0
• W.carter — CC0
• W.carter — CC0
• Walt Disney / Ub Iwerks — Public domain
• Warren LeMay from Cincinnati, OH, United States — CC0
• Wikimedia Commons — CC BY 4.0
• Wikimedia Commons — Public domain
• Wikimedia Commons — CC0
• Wikimedia Commons — CC BY 4.0
• Wikimedia Commons — CC0
• Wikimedia Commons — CC0
• Winnexjxjdjd — CC BY-SA 4.0
• Witold Rola Piekarski — Public domain
• Wolfmann — CC BY-SA 4.0
• www.readyelements.com — CC0 1.0
• X-ray: NASA/CXC/SAO/R. DiStefano, et al.; Optical: NASA/ESA/STScI/Gendler; Illus — Public domain
• Xuan Che — CC BY 2.0
• Yaoshiiscool — CC BY-SA 4.0
• Yashima Gakutei — Public domain
• YellowstoneNPS — Public Domain
• Yomomo — CC0
• YoureAGhostBaby — CC BY-SA 4.0
• Z. Levay (STScI/AURA/NASA), T.A. Rector (University of Alaska Anchorage) and H. — CC BY 4.0
• Zach Dischner — CC BY 2.0
• zbigphotography (1M+ views) — CC BY 2.0
• Zephyris — CC BY-SA 3.0
• Zhu Siben, redrafted and revised by Luo Hongxian, edited by Hu Song — Public domain
• ZionNPS — Public domain
• 多多123 — CC BY 4.0

All images are used under their respective Creative Commons or public-domain licences. Licence details are linked from each source.