#1 A Brief History of Time - My Notes and Thoughts
Updated: Jul 31
Chapter 1: Our picture of the universe
History of our understandings of the universe
Flat Earth theory
340 BC Aristotle - "Earth is a round sphere"
Aristotle & Ptolemy - Earth is stationary and is the center of our solar system
1514 Nicholas Copernicus- Earth and the other planets orbit the sun, Kepler and Galilei publicly supported Nicholas' theory
1609 Galileo started observing the sky with a telescope, this blew death to Ptolemy's theory - Earth is not the center of our solar system
1687 Newton developed mathematics to analyze motions in space and time
1929 Hubble made the landmark observation- the universe is expanding
Einstein's relative theory- space and time are related and are variable
The ultimate goal of science: to provide a single theory which describes the universe
Today, scientists describe the universe in terms of 2 partial theories: the general theory of relativity and quantum mechanics
