Quantum Physics for Beginners: The Easy Guide to Understand how Everything Works through the Behavior of Matter, the Law of Attraction and the Theory of Relativity by Hayes Ethan

Author:Hayes, Ethan [Hayes, Ethan]
Language: eng
Format: epub
Published: 2020-10-30T00:00:00+00:00

Chapter 9: The Theory of Relativity

In 1907, only two years after developing the theory of special relativity, Einstein had the idea that he would describe as “the happiest of his entire life.” In this inner vision, what would be revealed as the essential physical basis of general relativity appeared to him, even if it would take him almost ten years to elaborate the theory mathematically. Einstein realized that “if a man falls freely, he would not feel his weight.”

Even the expression “free fall” is telling though, that one is always attached to a gravitational field, attracted to the Earth from Newtonian theory's perspective. One finds freedom when one is falling. It is this freedom that those who pursue free-falling as a hobby seek to find and to feel, even if it is only partly due to air resistance. It is, of course, astronauts in “weightlessness” who truly experience over a long period this feeling of no longer having any weight, of no longer being subject to the force of the Earth’s attraction. Nevertheless, Einstein's great idea was the understanding that, if we jump up, during the brief moment of our jump, we experience this “weightlessness.”

In more words, there is no difference in principle between a vessel in orbit around the Earth and a ball which we throw here on Earth: both are in free fall; both are, for the duration of their motion, satellites of the Earth.

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