Something that humanity has been asking throughout the different ages is whether our planet was the only one that harbored living forms.
From this mere question the most bloodthirsty conflicts have developed, but also the purest and altruistic feelings.
It has been a cause of religious persecutions and dogmas of faith, giving the most confronted positions. Thus, there are supporters of considering the human being and all living forms as something unique in the Universe, while others are prone to believe that, if life occurred on Earth, quite possibly already happened, it is happening and will occur on other planets. .
All the proposals that have been made in the laboratory to reproduce the conditions in which life originated have turned out to be very complex, requiring certain conditions so severe and extreme that, sometimes they have not seemed to be supported by the sedimentary record.
In other words: the data that rocks have offered to geologists about the earliest times, when life originated, is very extreme and limited. They are often reduced to few samples and from areas so small that they do not allow generalization to the entire earth's surface.
For their part, the fossils make something very clear: the transition from simple to complex life, which allowed the emergence of multicellular and bilateral organisms, has only happened once in the 4.6 billion years of age on Earth.
But even so, and although in such an extreme way, life on our planet has developed. Can it happen in another of the millions of thousands existing in the universe? What do the evidences say?
In 2008, NASA launched a mission focused on the search for possible twin planets to Earth that could harbor life. Your name? Kepler operation. The main tool was a huge telescope equipped with numerous complementary instruments that was launched into space in March 2009. But this will be discussed in the next article ...
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