A briefer history of time pdf free download

The specific problem is: Wikipedia is not meant to give a chapter-by-chapter a briefer history of time pdf free download of the entire book’s contents. The Illustrated A Brief History of Time has pictures to help explain its ideas. It was also updated because new information was found. A Briefer History of Time is shorter than the first version and was also updated.

This book is very popular and well-known. A picture of what Ptolemy thought about the location of the planets, stars, and sun. In this book, Hawking talks about many theories in physics. In the first part of the book, Hawking talks about the history of physics. He made a planetary model that described Aristotle’s thinking. Ptolemy ideas about the position of the stars and sun was disproved in 1609.

Hawkins describes the motion of planets moving around the sun and how gravity works between the planets and the sun. He also talks about the ideas of absolute rest and absolute position. These ideas are about the thought that events stay in place over a period of time. This was found not to be true by Newton’s laws of gravity. However, scientists found a problem when they tried to say that light always traveled at the same speed.

The top of the light cone tells where the light from the event will travel. The bottom tells where the light was in the past. The center of the light cone is the event. Besides light cones, Hawking also talks about how light can bend. After talking about light, Hawking talks about time in Einstein’s theory of relativity. Einstein’s theory makes is that time will go by slower when something is near huge masses. However, when something is farther away from the mass, time will go by faster.

The Big Bang is shown here. The universe is getting bigger over time. The Doppler shift happens when something moves toward or away from another object. Red shifting happens when something is moving away from us. Red-shift is linked to the belief that the universe is expanding as the wavelength of the light is increasing, almost as if stretched as planets and galaxies move away from us, which shares similarities to that of the Doppler effect, involving sound waves.

Blue shifting happens when something is moving toward us, the opposite process of red-shift, in which the wavelength decreases and frequency increases, shifting the light towards the blue end of the spectrum. Hawking uses the Doppler shift to explain that the universe is getting bigger. To find where a particle is, scientists shine light at the particle. The uncertainty principle disproved the idea of a theory that was deterministic, or something that would predict everything in the future. Here is a picture of a light wave.

How light behaves is also talked more about in this chapter. Light interference causes many colors to appear. The highest point of a wave is the crest, and the lowest part of the wave is a trough. When light waves interfere with each other, this can make many colors.