Field equations
Field equation of Einstein's General theory of relativity is perhaps one of the greatest theories ever discovered by any human intellect. It reveals certain structure of the physical world, which has great impact on philosophy and science. Gravity can be easily explained using the field equations as a curvature of spacetime. It is a tensor equation and so valid in any reference frame. Although field equation is harder to solve , many exact solutions had been found over a century. Solutions of field equations gave many interesting fact about the universe like black holes, worm hole and time travel. Wor m hole is a hypothetical gateway that connect s two distance regions of space. it can be used as a time machine also. In the movie interstellar the cure of the ship travel through wormhole , which was shown to be a sphere in three dimensions.
