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When we are looking with our big telescopes to space, to find if there is any case for life somewhere else, we are looking some specific characteristics which are:
*. Kind of Star ( Sun ) and the possibility
to orbit a planet round of it.
*. Distance of the possible planet from
the star.
*. Climate conditions in planets atmosphaire.
Our Gallaxy consists of 200 - 250 billions of stars. Even
if the creation of planets round a star is a physical procedure, only a few are able to create planets. Because
some of them orbit round of themselves so quickly, and they don't permit the creation and some other are simply
old with small life duration. The stars that are able to create planets are only the 10%. They are like our sun,
with 10 billions years life duraton. Even to these stars, we haven't yet found proof of life existence.
The distance is also very important. If planet is close to the star, then it will be very hot. Everything in te planet will be burned. Such planets are Venue and Mercury. In these planets the temperature is about 450 - 480 C. So there no possibility for water existence in liquid form and of course no life. If the planet is far from its planet, then it will be cold. In a cold planet there is also no possibility for life existence. So, the distance is very important , because is the controller of temperature. The planet must be neither close to the star nor far.
About the climate, there is the scientific conclusion that even if we discover ocsygen in planets atmosphaire, this is no evidence for possible life existence, although oxcygen is the necessary characteristic for the survival of human beings and every living creature. When life appered in the Earth's surface, there was no oxcygen in the atmoshaire. If there was oxcygen , there would be no life. Because oxcygen would destry every form of life by oxidaton. The oxygen we meet in the Earth's atmoshaire is a result of a procedure where plants ( first appeared protozoa and then plants ) "eats" with the help of Sun's energy coals dioxide from the atmpshaire and "spit" the oxygen as trush. This is the oxcygen has been created and then ozone that protects us from the dangerous suns energy waves.