Stephen Hawkings, a brilliant mind of today, begins his book with a series of questions that are very important to us: Where did the universe come from? What is the nature of time? Will the universe come to an end? For those expecting him to give a final answer to these gigantic questions, they best look elsewhere. He, as the mortal human being that he is, cannot give us a final answer, but can only suggest an answer. They are very good answers, however.
He goes on to explain how Aristotle made an argument that the Earth was round but thought that it was at its center. Then Ptolemy advanced this and came up with a model for the planets and the sun, but it was still a geocentric model. Finally, Copernicus invents the heliocentric model but it was not taken up until Galileo publicly supported it. Kepler then proceeded to complete the model by saying that the planets did not move in circles but rather in ellipses.
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