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Theory of relativity is proposed by albert einstein.it means the mass can be converted into energy and energy can be converted into mass....
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The theory of relativity, or simply relativity in physics, usually encompasses two theories by albert einstien: special relativity and  general relativity Concepts introduced by the theories of relativity include: Measurements of various quantities are relative to the velocities of In particulars space contracts and time dilates
space time: space and time should be considered together and in relation to each other.The speed of light is nonetheless invariant, the same for all observers. The term "theory of relativity" was based on the expression "relative theory"  used in 1906 by max plancks who emphasized how the theory uses the principle of relativity. In the discussion section of the same paper, alfred bulchrer used for the first time the expression "theory of relativity.

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