Dr. Muhammad Zahid Mughal is working as an Assistant Professor in the Department of Mathematics with a specialization in the field of Gravitation and Cosmology. He earned his Ph.D. from the University of Gujrat, Gujrat, Pakistan. Gravitation and modern cosmology both are studied based on general relativity, which is a theory of the structure of spacetime and gravitation. It generalizes the special theory of relativity by extending its principle of relativity to incorporate accelerated frames of reference. The transformation between inertial frames by Lorentz transformations is accomplished in special relativity when transformations between relatively non-inertial (accelerated frames) known as general covariance is achieved by the equivalence principle of Inertia and gravitation which removes gravity as a force and replaces it with the newly introduced concept of curvature of spacetime defined at every point of spacetime. Thus, gravity   becomes ingrained into the geometric structure of spacetime itself. Relativistic cosmology is based upon general relativity, Weyl’s principle, and cosmological principle and studies the universe in its entirety from its beginning in spacetime or as spacetime itself to its evolution in the present form and its ultimate fate therein.