Einstein's theory of relativity emerges from the volcano between Newtonian mechanics on the behavior of matter (ether) with Maxwell's electromagnet (the speed of light). Special relativity theory unites space and time into space-time. This theory states the existence of time elongation because time is a dimension that has a direction that depends on the speed of the observer. The theory of general relativity presents a new concept of gravity that unifies between gravity and relativity while Einstein's concept of gravity. The general concept of gravity states space - time is not flat, the auction is curved and distorted by the mass and energy in it. This idea gives birth to a view of the universe or the finite but infinite universe.
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This is a very good summary. It neatly pointed out all the salient points in the theories of Relativity. I thank you for taking the time to visit.