Pedram Sahba: Mars

Some people believe that intelligent life exists only on Earth because of two main reasons. First, they have no evidence for extra-terrestrial intelligent life, and second the main conditions for forming a complex life exist just on Earth.

The supporters of the above mentioned idea believe that there is no evidence for the extra-terrestrial intelligent life. There is no clear signal and no contact from the other planets. They say if there were any intelligent life in the universe, they would call us or show their tendency to contact us. Also, we have no response from them. Astronomers have sent many radio signals through the huge and strong antenna to the space during last century, but there has been no reply.

On the other hand, to form a complex life like what we have on Earth, we need unique physical and chemical conditions. These conditions include for instance chemical elements, temperature and pressure. Statistically, the chance of gathering these conditions together is near zero. If we assume that a simple life has been formed in one of the millions planets in the universe, evolution of a simple life to an intelligent one needs other conditions same as those we have on our planet. These situations should remain unchanged during millions of years to let a simple life change to a complex one. As the supporters of the idea say, these conditions in the planet are not in a steady state due to the effect of the big neighbouring stars near them. Therefore, they don`t expect to an intelligent life out of our planet.

In conclusion the supporters of the idea think we are alone in the universe. There is no intelligent extra-terrestrial life due to unique situations of our planet. If it we accept it, so we should pay more attention to our planet. We should keep it green and neat for next generations because if its unique conditions change, there will be no other place to live. In my opinion whether we have any intelligent neighbours or not, we should take good care of our home planet. This is a chance to live on the Earth so we should care about it, and also, let to our children enjoy this chance.