ABSTRACT
From the Newtonian conception of gravity as a universal and instantaneously acting force to the Einsteinian one wherein the Newtonian gravity is seen as a manifestation of the curvature of the space-time involved a revision of the space and time to a changeable, merged entity called a space-time. It extended the scope of gravitational phenomena from solar system scale to cosmological scale, triggered further instabilities in the stellar equilibria to suggest formation of the black holes, accommodated an expanding universe providing a mechanism for formation of structures at various scales and gave an independent dynamical status (degrees of freedom) to the space-time geometry via the brand new prediction of gravitational waves. This transition came about by the challenge thrown by special relativity at the Newtonian gravity with its accidental equality of inertial and gravitational masses. The relativistic gravity faces its own new challenges. What are these challenges?
