Question

What do you mean by theory of relativity

Answer 1

the theory of relativity States that's the law of Physics at the same for all non accelerating observed , and is showed that the speed of light within a vacuum is the same no matter the speed of which an observer Travels ....

Answer 2

theory, formulated essentially by Albert Einstein, that all motion must be defined relative to a frame of reference and that space and time are relative, rather than absolute concepts: it consists of two principal parts.

theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels.

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