On November 25, 1915, Albert Einstein published his famous theory of General Relativity, which is a geometrical representation of gravity. In this work, Einstein described how spacetime curves in the presence of energy/matter. According to the theory of General Relativity, gravity is the manifestation of this curvature. Mathematically, the relationship between the spacetime curvature and the energy/matter content in space is given by Einstein’s field equation: where the left side of this equation is the Einstein Tensor, which describes the geometry of spacetime. The right side of this equation is the Stress-Energy-Momentum Tensor, which describes the distribution of energy/matter in spacetime. Physicists and Astronomers often say that matter tells spacetime how to curve, and curved spacetime tells matter how to move. Figure 1 illustrates how the distribution of energy/matter will curve spacetime. The more massive the object, the more it …
