Origin of earth - big bang hypothesis, PL-SQL Programming



  • Origin of life is linked to origin of earth.
  • Cosmos, the Universe originated 10-20 billion years ago by Big Bang (thermonuclear explosion).
  • Its part, a galaxy, (e.g., our Milky Way) comprises millions of stars, (our Sun is one of those).
  • Sun, its planets and satellite constitute the solar system.
  • Our earth is the 3rd planet with rocks, water & atmosphere.
  • It began as gaseous clouds of metals and non-metal atoms, later condensed to form surface rocks and boiling fluid core with gaseous atmosphere.

Chronology of events


Ago (Billion yrs)



Solar system




Oldest surviving rock


Life (Heterotrophs)


Old rock






Oldest microfossils




Photosynthetic procaryotes






  • Earth is formed by gradual condensation of interstellar dust, from which our entire solar system is presumed to be formed.
Posted Date: 10/8/2012 8:25:37 AM | Location : United States

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