A Brief History of Time Summary Essay

1371 Words6 Pages
Theoretical Physics, a modern topic of science with an extremely deterring sound and famous for being beyond complex, is a subject which cannot be explained with ease. Stephen Hawking, the most famous living scientist today, wrote A Brief History of Time in 1988, updated in 1996, in order to take upon this daunting task of explaining basic theoretical physics to a population who had previously barely studied any science. Within A Brief History of Time, Hawking touches upon seven topics in-depth while easily explaining them in a simple manner: our picture of the universe, space and time, the expanding universe, the uncertainty principle, elementary particles and the forces of nature, black holes, and the origin and fate of the universe.…show more content…
Thus, the ether was created. Albert Einstein proposed though that the ether was not needed, for objects do not have to be at absolute rest as long as there was no absolute time. Thus, the theory of relativity was developed. In his discussion of light, Hawking cites that light is described by a cone. The top of the cone represents the future path of light, the bottom half of the cone represents the past path of the light, while the central vertex represents the actual light. In the third chapter, Hawking takes upon the continuous and accelerated expansion of the universe. In order to prove this, he uses the “Doppler shift” which is almost identical to the Doppler Effect. In sound, the Doppler Effect creates an increasingly louder sound as the event approaches us, and then as the event moves away the sound begins to dull. In light the same basis applies, but with a color shift. Blue shifting and red shifting are the opposite effects of the “Doppler shift”. When objects are moving away from us, their light is shifted in the red direction on the electromagnetic spectrum. Inversely, as objects approach us; their light is shifted in the blue direction. Hawking uses this to prove the expansion of the universe, for many stars found by Edwin Hubble, of whom the Hubble telescope is named after, are observed to be red shifted. Thus, Hawking cites the
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