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Just hundred years ago the world of 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 discussed the 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 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 set of 10 equations called \bf{Einstein's {\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 $T_{\mu\nu}$).