Summary of Stephen Hawking s A Brief History of Time
29 pages
English

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29 pages
English

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Description

Please note: This is a companion version & not the original book.
Sample Book Insights:
#1 The ancient Greek philosopher Aristotle believed that the earth was a round sphere rather than a flat plate. He knew that eclipses of the moon were caused by the earth coming between the sun and the moon, and that the North Star appeared lower in the sky when viewed in the south than it did in more northerly regions.
#2 Aristotle believed the earth was the center of the universe, and that circular motion was the most perfect. This idea was elaborated by Ptolemy in the second century AD into a complete cosmological model.
#3 The Ptolemaic model was a reasonably accurate system for predicting the positions of heavenly bodies in the sky. However, it made an assumption that the moon followed a path that sometimes brought it twice as close to the earth as at other times.
#4 The Copernican model got rid of Ptolemy’s celestial spheres, and with them, the idea that the universe had a natural boundary. Since fixed stars did not appear to change their positions apart from a rotation across the sky caused by the earth spinning on its axis, it became natural to suppose that the fixed stars were objects like our sun but much farther away.

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Informations

Publié par
Date de parution 20 mars 2022
Nombre de lectures 0
EAN13 9781669354796
Langue English
Poids de l'ouvrage 1 Mo

Informations légales : prix de location à la page 0,0150€. Cette information est donnée uniquement à titre indicatif conformément à la législation en vigueur.

Extrait

Insights on Stephen Hawking's A Brief History of Time
Contents Insights from Chapter 1 Insights from Chapter 2 Insights from Chapter 3 Insights from Chapter 4 Insights from Chapter 5 Insights from Chapter 6 Insights from Chapter 7 Insights from Chapter 8 Insights from Chapter 9 Insights from Chapter 10 Insights from Chapter 11
Insights from Chapter 1



#1

The ancient Greek philosopher Aristotle believed that the earth was a round sphere rather than a flat plate. He knew that eclipses of the moon were caused by the earth coming between the sun and the moon, and that the North Star appeared lower in the sky when viewed in the south than it did in more northerly regions.

#2

Aristotle believed the earth was the center of the universe, and that circular motion was the most perfect. This idea was elaborated by Ptolemy in the second century AD into a complete cosmological model.

#3

The Ptolemaic model was a reasonably accurate system for predicting the positions of heavenly bodies in the sky. However, it made an assumption that the moon followed a path that sometimes brought it twice as close to the earth as at other times.

#4

The Copernican model got rid of Ptolemy’s celestial spheres, and with them, the idea that the universe had a natural boundary. Since fixed stars did not appear to change their positions apart from a rotation across the sky caused by the earth spinning on its axis, it became natural to suppose that the fixed stars were objects like our sun but much farther away.

#5

The universe was believed to have existed forever in an unchanging state or had been created at a finite time in the past more or less as we observe it today. However, it was believed that the gravitational force between objects was repulsive at very large distances, allowing an infinite distribution of stars to remain in equilibrium.

#6

The beginning of the universe had been discussed long before the 20th century. The ancient Greeks believed that the human race and the world around them had existed forever, while the Jews, Christians, and Muslims believed that the universe had a beginning in the past.

#7

When people believed in an essentially static and unchanging universe, the question of whether or not the universe had a beginning was one of metaphysics or theology. But in 1929, Edwin Hubble made the landmark observation that distant galaxies are moving away from us.

#8

A scientific theory is a model of the universe, or a restricted part of it, and a set of rules that relate quantities in the model to observations that we make. It exists only in our minds and does not have any other reality. A good theory is characterized by the fact that it makes a number of predictions that could be disproved or falsified by observation.

#9

The goal of science is to provide a single theory that describes the whole universe. However, scientists typically break the problem up into two parts: the laws that describe how the universe changes with time, and the question of the initial state of the universe.

#10

The search for a complete unified theory is difficult to justify on practical grounds. It may not even affect our life-style, but we still yearn to understand the universe.
Insights from Chapter 2



#1

Galileo’s and Newton’s ideas about the motion of bodies date back to Aristotle, who said that a body was at rest unless acted upon by a force or impulse. It followed that a heavy body would fall faster than a light one, because it would have a greater pull toward the earth.

#2

The laws of motion are the basis of all of physics. They state that a body will accelerate, or change its speed, at a rate that is proportional to the force.

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