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| This deceptively simple looking equation very neatly encapsulates the curvature of space and time that is caused by the presence of matter and energy.The left hand side describes only the geometric properties of spacetime , while the right hand side describes the concentration of matter and energy, The subscripts each take values 0 to 3 (for a 4-dimensional spacetime) so this is really 16 equations in one. Notice the presence of 'c' the speed of EMR in vacuo and 'G' the universal gravitational constant. |