Einsteins Theory of Relativity

　　Special Relativity

　　Relativity says that light always moves in a straight line through empty space, and always at the same speed in a vacuum, no matter what your observation point. From these simple claims follow bizarre consequence that challenge common sense and our perception of reality.

　　 A moving clock runs slower than a stationary one from the perspective of a stationary observer.

　　 A moving object appears to shrink in the direction of motion, as seen by a stationary observer

　　General Relativity

　　In general relativity, time is considered a dimension like height, width and depth, creating a four dimensional universe called space-time. Einstein argued that gravity is really a warping of space-time,with the greatest distortions near the most massive objects. Because light travels in a straight line through the contours of space-time, a light beam will curve where space-time curves, this curving was first measured in 1919

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