After the development of science, human tried to answer the question that how life originated on the earth and when? It was clear from the Darwin theory of evolution that earth originated as a hot solid ball and cooled down gradually and then its atmosphere was formed. simple compounds were formed by the association of the elements present in the atmosphere and then more complex compounds were formed from then. these compounds also had basis of life molecules such water , amino acids, etc. the condensation of these molecules accidently originated into the first living being. the first living being through
bio-development gave birth to all the living being including humans. the reason for origin of life on earth is the earth s respective distance from the sun. the earth is far away from the sun that water can stay liquid from here.
Along with the increase in information associated with space, it was clear that our galaxy had billions of stars as the Sun. many of which have their own solar system and families. these various solar system have planets similar to the earth where life can be possible. along with the development of radio astronomy, we came to know that the chemical molecular which led to the origin of the earth present in the universe, some may have have life. this was also believed that many planet might have life much more developed than the earth. from all this, originated the thinking of people regarding aliens coming to the earth in this spaceships.
In the year 1972, when pioneer 10 was launched, it was very much believed that highly developed life existed out of the earth. at that time, scientists were scared that due to any wrong notion, the life outside earth would attack people on earth. pioneer 10 was the first spacecraft to fly by Jupiter and became the first spacecraft to achieve escape velocity from the solar system. fear was that during it infinity journey, pioneer 10 would come in contact of some developed culture. the developed culture would consider pioneer 10 as an attack over then from the people of the earth and they would counter-attack on us. to remove this misconception, a plate was played on pioneer 10 depicting male and female in a friendly gesture, and in, sing language, a message was written about pioneer-10 being sent from the earth. as planned, pioneer 10 completed its mission successfully and on traces of outside life elsewhere were found.
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