The Sun And The Planets In The Solar System Such As Mercury, Venus, Earth And Others Are Part Of A Galaxy. There Are Innumerable Galaxies In The Universe. The Heavenly Bodies Move, Spin On Account Of The Gravity Each Body Exercises. It Is Mind-Boggling To Speculate On The Size Or Number Of The Stars, Planets, And The Distances At Which They Are Placed. The Science Of Cosmology Has Unraveled Quite A Few Phenomena, Yet What Is Known Is A Fragment Of The Infinite