During the day we see the Sim shining brightly and during dark nights we see thousands of twinkling objects in the sky. The Sun and all these twinkling objects are called heavenly bodies. The heavenly bodies which have their, own heat and light are termed as stars. All the objects like the Sun, the Earth, the Moon and lakhs of bright objects seen during the night in the sky are also called celestial bodies. All these celestial bodies form the universe.