Einstein's theory of relativity consists of special relativity and general relativity, which are built on the principle of relativity and the local constancy of the speed of light. In these theories space and time became unified as spacetime. In general relativity, the concept that this spacetime could be curved was introduced. This curved spacetime replaced Newton's force of gravity and the source of gravitation.
NOVA: Einstein's Big Idea
[ Teens/Mature Teens ] Learn about Einstein's general relativity and how the theory might help to describe the nature of the universe. Article describes how his work helped other scientists to discover the big bang theory and black holes.
[Einstein_Mozilla]
Last update:
February 11, 2015 at 6:15:07 UTC
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