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Just hundred years ago our idea the world  of our world's deep inner workings changed radically. physics (and not only) was shaken by a visionary work.  One man alone brought to humankind a profoundly different perspective on the very nature of, arguably, the most relevant aspects of our perceived reality: space and time. In his 1915 work called "General Theory of Relativity", Albert Einsten described for discussed  the first time these two previously disjoint pillars intimate connection between space, time, energy and mass. The picture that emerges is extremely elegant.   %geometric theory in which the force of gravity emerges naturally  as manifestations the stretching and bending of space-time caused by the presence  of %mass and/or energy.   The pinnacle of the theory is equation~\ref{einstein}, actually  a unique entity set of 10 equations  called spacetime. \bf{Einstein's Field Equations}.   These equations describe gravitation as a result of space-time being curved by matter and energy.   Space and time (described by $G_{\mu\nu}$) are not static quantities, but are affected by the presence of mass and energy (enclosed in $T_{\mu\nu}$).