PICTURE CREDITS

here: Albert Ziganshin/Shutterstock; here: NASA; here: Shutterstock; here: John Arnold/Superstock; here: Prometheus Entertainment; here: National Archives and Records Administration; here background: Shutterstock; here: Ton Koene/Superstock; here: (left to right): Steve Whiston/Superstock, Prometheus Entertainment, LACMA- www.lacma.org, Superstock, De Agostini/A. Dogli Oriti—Getty Images; here: NASA; here: NASA; here: NASA; here: Shutterstock; here background: NASA; here: iurii/Shutterstock; here: sacredtexts.com/public domain (India and US); here: Superstock; here: National Geographic Image Collection; here: Superstock; here: Prometheus Entertainment; here: Library of Congress public domain; here: Shutterstock; here: NASA; here: Fine Art Images/Superstock; here: F1 ONLINE/Superstock; Photononstop/Superstock; here: National Geographic Stock Images; here: Iryna 1/Shutterstock; here: Hans P. Szyszka/Novarc/Corbis; here: fstockfoto/Shutterstock; here: Alberto Loyo/Shutterstock; here: National Geographic Image Collection/Alamy; here: Fulcanelli/Shutterstock; here–here: Christina Rutz; here: AridOcean/Shutterstock; here, here: Dmitry Burlakov/Shutterstock; here: David Hlavacek/Shutterstock; here: National Geographic Stock Images; here: Prometheus Entertainment; here: NASA/JPL-Caltech/IRAS /H. McCallon; here: Kokhanchikov/Shutterstock; here: Manamana/Shutterstock; here: chasethestorm.com/Shutterstock; here: A&E Television Network; here: Christian Musat/Shutterstock; here: Joze Pojbic/Getty Images; here: A&E Television Network; here: Nemequene- Wikimedia_Quimbaya; here: NASA; here: Linda Bucklin/ Shutterstock; here: William Scott-Elliott; here: Elena Yakusheva/ Shutterstock; here: JTB Media Creation, inc./ Alamy; here: Georgios Kollidas/ Shutterstock; here: Anton Ivanov/ Shutterstock; here: Prometheus Entertainment; here: Shutterstock; here: De Agostini/ A. Dogli Oriti—Getty Images; here: Royal Armouries, Leeds, UK / Bridgeman Images; here: Fer Gregory/ Shutterstock; here: Nikonaft/Shutterstock; here: Fine Art Images/ Superstock; here: James Wheeler/ Shutterstock; here: Paul Fleet/ Shutterstock; here: James L. Stanfield/National Geographic Creative; here: NASA; here (left to right): Malchev/Shutterstock, Bridgeman Art Library/ Superstock; Shutterstock; here: Thewada1976/Shutterstock; here: Victor Habbick/ Shutterstock; here: Ursatii/Shutterstock; here: National Geographic Stock Images; here: S.E. Hayden, 1897, The Dallas Morning News; here: Lori D. Martin; here: Prometheus Entertainment; here: Wellnhofer; here: John Herbert Evelyn Partington; unknown; here: Photobank Gallery/ Shutterstock