To video clip describes the stages of a star's life from birth to death. The stars were created before the galaxies from gas vortexes after the great eruption 15 billion years ago. The birth of a star begins from the concentration of air masses, which increases the temperature. The increase of the temperature increases the nuclear reactions (e.g. conversion of H to He) and the star is born of balance between the nuclear powers that push outward and the gravitational powers that push inward. Such a budding star is the M42 nebula in the constellation Orion. This balance will collapse when fuel have been exhausted. Then the star will become a red giant and a Supernova explosion will eject material until it became a white dwarf or neutron star with huge density. Our sun being 4.5 billion years old is considered a middle-aged star.