Upon completion of this lesson, the students should be able to:
A galaxy is a huge assembly of stars, dust and gases, mutually held together by gravitational force . Millions of stars are present in the galaxy and the diameter of galaxy ranges from 1000 light years to one million light years. This note contains information on types and examples of galaxies and constellations.
The star are self glowing heavenly bodies which generate the energy themselves by nuclear fusion reaction. This note contains information on stars their birth and death.
The giant family of sun including planets, asteroids , comets etc is called solar system. This note contains information on sun and our solar system.