Astronomical observation is the study of celestial objects and phenomena in the sky. It involves the use of telescopes and other instruments to observe and measure the properties of stars, planets, galaxies, and other astronomical objects. The term STAR is a four-letter word used to describe a luminous sphere of gas held together by its own gravity. Stars are the most prominent astronomical objects, and they are composed of plasma and dust. They are the source of most of the visible light in the universe and are responsible for the production of energy through nuclear fusion.