Astronomers estimate that the earth, like other solar planets, was formed over four billion years ago by the agglomeration of particles of matter in space. Later when the temperature and atmospheric conditions of the earth were suitable, life originated on it as a result of chemical activity. Molecules of livable organic matter were formed from methane, ammonia and water of the primitive atmosphere of the earth under the influence of solar and volcanic energies. (Simulating the conditions of the primitive atmosphere of the earth, the Nobel Laureate Dr. Har Gobind Khorana and Dr. Cyril Ponnamperuma had successfully produced molecules in their laboratories). These molecules in due course developed the property of replicating and producing energy through slow oxidation called respiration. It is this type of energy produced by respiring organic matter that we call life. Livable matter becomes a living body when it respires and produces vital energy (life).
The molecules of organic matter formed on the primitive earth produced unicellular organisms in due course, which as a result of millions of years of evolution gave rise to the present flora and fauna.
Harlow Shapply, the famous astrophysicist, says here can be millions of planets in space where life is possible. Some of these planets there may organisms much more intelligent and much more evolved than man.
