1.5. REFERENCES 21
In practice, even if an astronomical object (the Sun for example) is made of the same
material throughout, Equation (1.36) is often too simplistic because most materials—gases in
particular—are compressible. e gas deep within the Sun, for example, has a much higher
density than the gas farther from the center even though it is made of the same mix of chemical
elements.
1.5 REFERENCES
John Beaver. e Physics and Art of Photography, Volume 1: Geometry and the Nature of Light. IOP
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e Physics and Art of Photography, Volume 3: Detectors and the Meaning of Digital
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IOP Publishing, 2018b. DOI: 10.1088/2053-2571/aaf0ae 3
Kees Boeke. Cosmic View: e Universe in 40 Jumps. John Day Company, New York, 1957. 6
Charles Eames and Jay Orear. Powers of ten-1978 (film). American Journal of Physics, 47(3):297–
297, March 1979. DOI: 10.1119/1.11851 6
Yvonne Jansen and Kasper Hornbak. A psychophysical investigation of size as a physical vari-
able. IEEE Transactions on Visualization and Computer Graphics, 22(1):479–488, January
2016. DOI: 10.1109/tvcg.2015.2467951 18
John North. e Norton History of Astronomy and Cosmology, W.W. Norton, New York, 1995.
10
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