286 Bildnachweis S. 9: yuriy_ilin / iStockphoto.com; S. 11: Henrik Dolle / Thinkstock; S. 13: Nikada / Getty Microstock; S. 16.1: Grassetto / Thinkstock; S. 16.2: Ancient Art and Architecture Collection Ltd. / Bridgeman Images; S. 17: Ralwel / Thinkstock; S. 18: Volker Wille / Fotolia; S. 22: James Tillinghast / Getty Images – iStockphoto; S. 23: suprun / Getty Images; S. 24: Martina Draper / öbv; S. 27: Ernst Weingartner / picturedesk.com; S. 29: akg-images / picturedesk.com; S. 30: Getty Images / Science Photo Library RF; S. 32: Andrey Kiselev / Fotolia; S. 34: t2sk5 / Fotolia; S. 38.1: MarianVejcik / Thinkstock; S. 38.2: monkeybusinessimages / Thinkstock; S. 39.1: Collection Abecasis / Science Photo Library / picturedesk.com; S. 39.2: Elke Ludewig / Sonnblick-Observatorium; S. 43: Byelikova Oksana / Fotolia; S. 45: NiseriN / Getty Images – iStockphoto; S. 46: zeljkosantrac / Getty Images – iStockphoto; S. 47.1: Tao_Shen / Thinkstock; S. 48.2: Denis Kabanov / Getty Images – iStockphoto; S. 48.1: Anna Kucherova / Thinkstock; S. 50.1: Tupungato / Shutterstock; S. 50.2: Kitch Bain / Fotolia; S. 51: akgimages / picturedesk.com; S. 52: Suwanmanee99 / Thinkstock; S. 59: snygo – aboutpixel.de; S. 60: VeselovaElena / Getty Images; S. 61: lambada / iStockphoto.com; S. 63: EPKIN / Thinkstock; S. 67: Michael Blann – Digital Vision / Thinkstock; S. 68: choness / Thinkstock; S. 71: modestil / Fotolia; S. 72.1: Sonja Birkelbach / Fotolia; S. 72.2: ladi59 / Thinkstock; S. 74: Markus Mainka / Fotolia.com; S. 75: frankix / Thinkstock; S. 76: SokolovskayaG / Thinkstock; S. 78: Thomas Laimgruber, Wien; S. 79: oksix / Fotolia; S. 80: Highwaystarz-Photography / Thinkstock; S. 84: Erich Lessing / picturedesk.com; S. 85: seraficus / iStockphoto.com; S. 86: Jeantrekkeur / Fotolia; S. 90: MarianVejcik / Getty Images – iStockphoto; S. 93: Fly View Productions / Getty Images – iStockphoto; S. 96: Rob Friedman / iStockphoto.com; S. 98: CasarsaGuru / Getty Images; S. 101: batuhanozdel / Thinkstock; S. 102: Nikolaev / Thinkstock; S. 103: Sonsedska / Getty Images – iStockphoto; S. 106-109: GeoGebra Institute; S. 110: Claudio Divizia / Shutterstock; S. 111: Bridgeman Art Library / picturedesk.com; S. 112: David Parsons / iStockphoto. com; S. 114: Ground Picture / Shutterstock; S. 116: Martina Draper / öbv; S. 118: vaitekune / Fotolia; S. 120: Martina Draper / öbv; S. 124: Martina Draper / öbv; S. 125: Himmelssturm / Fotolia; S. 126: Marius Graf / Fotolia; S. 127: Elena Elisseeva / Thinkstock; S. 128: snygo – aboutpixel.de; S. 129: naturganznah; S. 132.1: Universal History Archive / Science Photo Library / picturedesk.com; S. 132.2: Science Photo Library / picturedesk.com; S. 133.1: Erich Lessing / picturedesk.com; S. 133.2: jurisam / iStockphoto.com; S. 134: Steve Debenport / iStockphoto.com; S. 140: imageteam / Fotolia; S. 145: GlobalP / Thinkstock; S. 146.1: CPaulussen / iStockphoto.com; S. 146.2: Lehner / iStockphoto.com; S. 147: Christian Kreuziger / picturedesk.com; S. 150-153: GeoGebra Institute; S. 154.1: Erich Lessing / picturedesk.com; S. 154.2: Statistik Austria; S. 155: akg-images / picturedesk.com; S. 156: diego_cervo / Thinkstock; S. 158: suratoho / Thinkstock; S. 159: Eetum / Thinkstock; S. 164: DavidSzabo / Thinkstock; S. 165.1: Imgorthand / Getty Images; S. 165.2: Freytag-Berndt und Artaria KG, Wien; S. 165.3: Freytag-Berndt und Artaria KG, Wien; S. 166.1: a_lis / Getty Microstock – iStockphoto; S. 166.2: Mailson Pignata / Getty Microstock – iStockphoto; S. 166.3: giuseppepapa / Getty Microstock – iStockphoto; S. 166.1: unpict – stock.adobe.com; S. 166.2: goir – stock.adobe.com; S. 166.1: Freytag-Berndt und Artaria KG, Wien; S. 171: ruzanna / Thinkstock; S. 174: GeoGebra Institute; S. 175: Microsoft Corporation; S. 176.1: Leamus / Thinkstock; S. 176.2: Max Galli / laif / picturedesk.com; S. 177.1: Wolfram Zummach / EPA / picturedesk.com ; S. 177.2: popcic / Thinkstock; S. 178.1: dudek / Fotolia; S. 180: Lucky Dragon / Fotolia; S. 180: Ernst Weingartner / Weingartner-Foto / picturedesk.com ; S. 182: snygo – aboutpixel.de; S. 183.1: Mag. Herbert Groß; S. 187.3: ShowVectorStudio / Thinkstock; S. 187: Martina Draper / öbv; S. 188.1: Jennifer Borton / iStockphoto.com; S. 188.2: MF_vxw / Thinkstock; S. 188.3: reeel / Fotolia; S. 188.4: jojoo64 / Thinkstock; S. 188.5: PictureP / Fotolia; S. 191: Martina Draper / öbv; S. 196: Adam Silye; S. 198.2: parys / Thinkstock; S. 198: pjhpix / iStockphoto.com; S. 202.1: akg-images / picturedesk.com; S. 202.2: G.M. Sauer, 2016 / Georg-August-Universität Göttingen, Sammlung historischer Gegenstände am Institut für Astrophysik, Inv. Nr. A061 ; S. 206.1: Martina Draper / öbv; S. 207.1: trendobjects – stock.adobe.com; S. 207.2: Felix Pergande / Fotolia; S. 207.3: Roman Bykhalets / Getty Images – iStockphoto; S. 207.4: DigiMua Stocker – stock.adobe.com; S. 207.5: Martina Draper / öbv; S. 209.1: Lledó / Fotolia; S. 209.2: Martina Draper / öbv; S. 211.1: mikeinlondon / iStockphoto. com; S. 211.2: Spas Tonov / iStockphoto.com; S. 212: dejanj01 / Thinkstock; S. 213: euroluftbild.de / Hans Blossey; S. 215: leiana / Fotolia; S. 216: DI Herbert Köhler; S. 226.1: suriya silsaksom / Thinkstock; S. 226.2: supermimicry / iStockphoto.com; S. 227.1: Martina Draper / öbv; S. 227.2: Martina Draper / öbv; S. 228: Anke Thomass – stock.adobe.com / Fotolia; S. 233: Photos.com / Thinkstock; S. 236.1: Purestock / Thinkstock; S. 236.2: microvictor / stock.adobe.com; S. 237.1: Irene Schramm-Biermann / https://www.schrammbiermann-bilder.de; S. 237.2: Mag. Bianca Prenner; S. 241: Roy Jankowski / Westend61 / picturedesk. com; S. 243: PASHA18 / iStockphoto.com; S. 245: Bildagentur-online/Schoening / Alamy Stock Foto; S. 247: Eduard Harkonen / Thinkstock; S. 249: Martina Draper / öbv, Wien; S. 250: Lora-Sutyagina / iStockphoto.com; S. 252: LianeM / Fotolia; S. 254: TheYok / Getty Images – iStockphoto; S. 255: mauritius images / imageBROKER / Thomas Robbin; S. 256: eclipse_images / Getty Images; S. 264-277: GeoGebra Institute Nur zu Prüfzwecken – Eigentum des Verlags öbv
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