Book Review: The Grand Design
Posted under: book review, education, science.
Tags: books, education, reading, science
In their book The Grand Design, Hawking and Mlodinow explain the way theories about quantum mechanics and relativity came together to shape our understanding of how our universe (and possibly others) formed out of nothing.
Hawking is eloquent in the way he describes and explains the workings of the universe.
Orbital eccentricity is a measure of how near an ellipse is to a circle. The degree to which an ellipse is squashed is described by what is called its eccentricity, a number between zero and one. The earth’s orbit has an eccentricity of only about 2 percent, which means it is nearly circular. Circular orbits are friendly to life, while very elongated orbits result in large seasonal temperature fluctuations. On Mercury, for example, with a 20 percent eccentricity, the temperature is over 200 degrees F warmer at the planet’s closest approach to the sun (perihelion) than when it is at its farthest from the sun (aphelion). (p. 150-151)
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Aug 06 2011





