


Learn about Albert Einstein’s theory of relativity, explained in simple terms. The former applies to all physical phenomena discounting gravity, and the latter explains the gravitational force in relation to the other forces of the universe. Within Einstein’s theory of relativity, there are actually two theories: special theory and general theory. What is the theory of relativity? What phenomena does the theory attempt to explain? How has it revolutionized our understanding of the workings of our universe?

Like this article? Sign up for a free trial here. Shortform has the world's best summaries and analyses of books you should be reading. This article is an excerpt from the Shortform book guide to "A Brief History of Time" by Stephen Hawking.
