xxii ACKNOWLEDGMENTS
Figure 9.10: Graphic by User:Worldtraveller - Own work,
commons.wikimedia.org/w/index.php?curid=1336088, CC BY-SA 3.0.
Figure 11.1: Henry Cavendish, “Experiments to determine the Density of the Earth” in
McKenzie, A.S. ed. Scientific Memoirs Vol.9: e Laws of Gravitation, American Book
Co. 1900. commons.wikimedia.org/w/index.php?curid=2621520, Public Domain.
Figure 11.2: Earth image: NASA/Apollo 17 crew; taken by either Harrison Schmitt
or Ron Evans, commons.wikimedia.org/w/index.php?curid=43894484, Public Domain.
Beaver image by Steve from Washington, DC, USA - American Beaver,
commons.wikimedia.org/w/index.php?curid=3963858, CC BY-SA 2.0.
Figure 11.5: ESA/Hubble & NASA, www.spacetelescope.org/images/potw1151a/, CC
BY-SA 4.0.
Figure 11.6: EHT Collaboration, www.eso.org/public/images/eso1907a/ (image link).
e highest-quality image (7416x4320 pixels, TIF, 16-bit, 180 Mb), CC BY 4.0.
Figure 12.4: By 4C - Own work, commons.wikimedia.org/w/index.php?curid=1017820,
CC BY-SA 3.0.
Figure 12.5: Image generated by the star map software Cybersky (available at
www.cybersky.com); used with permission.
Figure 12.6: Data by BAA (J. Montier), britastro.org/specdb/index.php.
Figure 12.7: Data by BAA (T. Rodda), britastro.org/specdb/index.php.
Figure 12.9: Image made with the Aladin Sky Atlas. DSS2, alasky.u-
strasbg.fr/DSS/DSSColor [Bonnarel et al., 2000, Lasker et al., 1996].
Figure 12.10: Images made with the Aladin Sky Atlas. DSS2: alasky.u-
strasbg.fr/DSS/DSSColor [Bonnarel et al., 2000, Lasker et al., 1996]. KMASS:
University of Massachusetts & IPAC/Caltech [Skrutskie et al., 2006]; AKARI: Univer-
sity of Tokyo, ISAS/JAXA, Tohoku University, University of Tsukuba, RAL and Open
University [Doi et al., 2015].
Figure 12.11: Image made with the Aladin Sky Atlas. DSS2, alasky.u-
strasbg.fr/DSS/DSSColor [Bonnarel et al., 2000, Lasker et al., 1996].
Figure 12.12: By 4C - Own work, CC BY-SA 3.0,
commons.wikimedia.org/w/index.php?curid=1017820.
Figure 13.1: By Wersje rastrowa wykonal uzytkownik polskiego projektu wikipedii: Artura
Jana Fijalkowskiego (WarX), Zwektoryzowal: Krzysztof Zajaczkowski,
commons.wikimedia.org/w/index.php?curid=11215685, GFDL.