  A basic modern picture of the universe is given here. The lectures start from
the historical ideas of a static universe. Then I move on to Newtonian
cosmology and derive the main cosmological equations in the framework of
Newtonian mechanics for the sake of simplicity. With a qualitative description
of general relativity, the expansion of the universe and elementary idea of the
hot Big Bang models are introduced. The problems of the hot Big Bang, inflation
and structure formation are explained here in simple language.
