The diagram below represents wavefronts spreading out from two sources in the ripple tank. The dark circles indicate crests of waves. B A Small floating corks are placed in the water at positions A, B and C.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.