Universe - its anatomy and facts.


  1. Universe contains everything that exists ,from tiniest subatomic particles to galactic superclusters (largest structures known).
  2. Nobody knows how big the universe is , but astronomers estimate that it contains atleast 125 billion galaxies, each comprising an average of 100 billion stars.
  3. The most widely accepted theory about the origin of the universe is the big bang theory which states that the universe came into being in a huge explosion - the big bang - that took place between 10 and 20 billion years ago.
  4. The universe initially consisted of a very hot dense fireball of expanding, cooling gas.
  5. After about one million years, the gas began to condense into localized clumps called protogalaxies.

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