Carl Sagan was one of the most famous and recognized North American artonomos, his books and theories in particular his book Cosmos would be translated and interpreted in many languages Grancia in all their successful approaches on important topics like the origin of life on our planet, the creation of the universe and extraterrestrial life. This great scientist, who felleciera in 1996 at age 62, always had very much in mind the importance of ethics in their work that is why all their approaches and theories should be based on a total and complete objectivity. According to this always was a supporter of concepts such as the formation and origin of life on Earth is completely linked with extraterrestrial life. This emphasizes that life will always have a corelacion inside the planet and beyond since its origin and formation depends on the sum of the same organic molecules. Moreover, Sagan theorizes about extraterrestrial life drawing on knowledge of life on Earth, its origins and subsequent evolution, to suggest that the substance of life is everywhere, and therefore, any life outside our planet could follow a process similar to ours.
The greatest test of his theories about the origin of life on the planet are based that they go beyond the theory of Abiogenesis, refer to a test very specific of the evolution of life from organic molecules is the existence of Europe one of the moons of Jupiter, and Titan the largest satellite of Saturn where easily oceans of what can be very possibly could to be water. Today this theory is very accepted in the average scientific and astronomical, similarly with the evolution of technology aero space it has been shown the veracity of the deSagan approach by which his theory about the origin of life here and there outside is by no means outrageous, is more fairly resembles the natural and evolutionary facts that are really very significant at the time of talk about this complex subject. Always let the concrete plateamiento the origin of life on Earth and beyond is due to a fact known as cosmic inevitability in which the process of evolution and transformation at the molecular level is an inevitable fact, a consequence of the action reaction resulting in the emergence of microscopic life, which subsequently and with much patience will evolve to conceive what today we can see and touch.