Life Cycle Of A Star

  WHAT IS A STAR:

     A star is a fiery luminous, bright and heavenly body that has its own light and heat energy.

  LIFE CYCLE OF A STAR:

     Stars are born in nebulae.  A nebula is a cloud of gas (Hydrogen) and dust in space.  Huge clouds of dust and gas collapse under gravitational forces forming protostars.

     These young stars undergo further collapse under gravitational forces forming the main sequence of stars.  Colors of the stars depend on its temperature.  Nuclear reactions release energy.

  EXPLANATION OF THE STARS:

     Stars expand as they grow old.  As the core runs out of Hydrogen and then Helium, the core contacts and the outer layer expands.

     They may be red giant or supergiant depending on its mass and temperature when they collapse they become black dwarf, black neutron stars, star or black hole.

  INITIAL LEVEL OF WHITE DWARF:

     It is very small, hot star, the last stage in the life cycle of a star like a sun.  White dwarfs have a mass similar to that of the sun but only 1 % of the sun's diameter, approximately the diameter of the earth.

  EXPLOSION OF THE STAR, THE SUPERNOVA:

     This is the explosive death of a star and often results in the star obtaining the brightness of 100 million suns for a short time.

  WHAT ARE NEUTRON STARS:

     These stars are composed mainly of neutrons and are produced when a supernova explodes, forcing the protons and electrons.

     Combine to form and produce a neutron star.  Typical stars have a mass of three times the sun but a diameter of only 20 km.

     Its mass has any greater value its gravity will be so strong that it will shrink further to become a black hole.

     Pulsars are believed to be neutron stars that are a spining car moving, very rapidly.

  WHAT IS A BLACK HOLE:

     Black holes are believed to form from massive stars at the end of their lifetimes.  The diversity of matter in a black hole cannot be measured.

     The gravitational pull in a black hole is so large that nothing can escape from it, not even light, it can often engulf neighbouring matters including stars and planets, etc.

  THE CHANDRA SHEKAR LIMIT:

     The calculation of the maximum mass of 1.44 solar masses.  There is a balance between electrons and gravitational force.

  WHAT ARE CONSTELLATIONS:

     A group shining stars having some specific shapes and sizes are called constellation.  The various constellation preven in our galaxy is Ursa Major, Ursa, minor, Draco, Orion, Cygnus, Hercules, etc.