Wednesday, 1 April 2015
Bill Bryson - Einstein's Universe
In Bill Bryson's A Short History of Everything, he writes a chapter about Einsteins Universe, in which he talks about the speed of light and other things. At the start of this chapter Bryson talks about the speed of light and how in the 1800s when physicists Albert Michelson and Edward Morley accidentally discovered the Ether, A medium that was thought to permeate the earth.This was needed in the 1800s when physicists thought that light and electromagnetism were seen as waves. Skip ahead a couple years and you find yourself Max Planck, a 42 year-old theoretical physicist at the university of Berlin. Planck unveiled a new quantum theory, which posited that energy is not a continuous thing like flowing water but comes in individualized packets, which he called quanta.This becomes relevant when talking about Einstien. Now on to everybody's favorite person, Alert Einstein, born in Ulm in 1879 Ablert wasn't a stand out kid, until later in life when he wrote the scientific paper "On the Electrodynamics of moving bodies". His famous equation "E = McSquared" came months later. In essence what relativity is, is your position relative to the moving object. Bryson goes on to talk about space time, and how gravity is a byproduct of space time. Edwin Hubble, the greatest astronomer of the 20th century, because he tackled these 2 questions. How old is the universe? and how big is it?. Although he did this, he couldn't understand why the universe never stopped expanding, that was discovered by Belgium pries-scholar Goerges Lemaitre who said that, the universe began as a geometric point, a 'primeval atom' , which burst into glory and hasn't stopped ever since.
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Bill Bryson
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Half way through the second setence you metioned a medium, what is this?
ReplyDeleteWhat is a medium? I didn't find the paragraph made sense without knowing this.
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