Sun, Earth and Moon in spacetime. Computer illustration showing spacetime with the gravitational wells made by sun, Earth and Moon. Spacetime is shown here on a two-dimensional grid, with gravitational potential represented by a third dimension. A product of Einstein's theory of relativity, spacetime describes any event using four coordinates - three giving the position in space and one the time. In the presence of a gravitational field spacetime becomes curved. This curvature means that the shortest distance between two points is not usually a straight line but a curve. The curvature due to gravity results in light bending when it passes by a massive object.

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TOP24754976

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達志影像

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RM

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須由TPG 完整授權

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