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The elevator, the rocket, and gravity: the equivalence principle
Information about the principle that Einstein took as a starting point for developing his general theory of relativity
...that all coordinate systems are created equal
Why, in general relativity, all observers are on an equal footing - and why, nevertheless, you can say that the earth orbits the sun, but not the other way ...
Gravity: from weightlessness to curvature
So what is gravity in Einstein's theory? The answer: in part, an illusion; in part, an aspect of geometry.