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Sciences > Physics Is time real or relative?

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Carl Sagan once described time in terms of shapes of two dimensional objects. One was a triangle the other a rectangle and still another a circle (for example). He gave life to them by describing from their perspective what they would see if they viewed each other. In their two dimensional world all that would be visible to them would be a line of a particular size. The circle could dance but because the circle is uniformly the same dimension no matter which side is presented for viewing in the plane, the rectangle and triangle would notice nothing but a line of the same size as he danced...

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