ABSTRACT
In cosmology we study the evolution of the universe starting with some simple principles, known as the cosmological principles. We try to relate astrophysical observations with the cosmological models that are developed based on the cosmological principles and the earlier observations and improve the model to explain newer phenomena. With many new inputs from satellite based observations and also highly sophisticated ground based experiments, the cosmological parameters have been determined with much higher accuracy, and we have a much better understanding of the evolution of our universe.
