Monday, January 6, 2020

Brief History Of Time By Stephen Hawking - 2268 Words

For the second semester book report I chose to read A Brief History of Time by Stephen Hawking. Before I started reading I knew what I signed up for. A lot of math, science and complicated stuff that sometimes makes my head hurt. Nonetheless A Brief History of Time is about the history of science, history of how the universe began and how the journey of finding the theory for everything has been going. He talks about some of the theories that may help with finding the theory like the black hole theory, general relativity, quantum mechanics, imaginary time, string theory and many more. He also mentions the belief that people have that god created the universe, that God created everything. The book starts with Stephen Hawking talking about†¦show more content†¦A Greek astronomer named Ptolemy agreed with Aristotle theory and made a model that provided a decent accurate system for predicting the places where heavenly bodies in the sky were located. His model was accepted and adopted generally. But then a simpler model made by a Polish priest, Nicholas Copernicus was suggested. His idea was that the sun was still at the center and that the earth and the planets moved in circular orbits around the sun. Two astronomers took this idea seriously Johannes Kepler and Galileo Galilei and they started publicly supporting the Copernican theory. The death of the Aristotelian/Ptolemaic theory came in 1609 when Galileo started to look at the sky with a telescope. When he looked at Jupiter he saw that it was by a lot of small satellites or moon that orbited around it. Johannes then changed Copernicus’s theory a bit by suggesting that the planets move in ellipses inste ad of circles. An explanation came when Isaac Newton published his Philosophiae Naturalis Principia mathematica in 1687. In it he provided a theory of how bodies move in space and time. He also made the complicated mathematics needed to analyze those motions. Then questions were raised like whether the universe had a beginning in time and whether it is limited in space. Edwin Hubble in 1929 made an observation that the galaxies are moving rapidly away from us like the universe is expanding. Then he thought that the universe was really close

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