Mankind is not aware of there being life on other planets because the period in which they were living was very short, says a group of Australian astronomers.
“In his early life is fragile, so we rarely evolve fast enough to survive,” said the website of the Australian National University professor of planetary biology Aditya Chopra.
The cause of this brevity is the high volatility environments: to adapt according to your needs agencies must learn quickly to regulate the presence of water and carbon dioxide in the atmosphere. If they fail, they expire, and Charles Lineweaver Chopra argue in an article signed jointly in Astrobiology .
The researchers admit that living beings in their most primitive forms might appear in many places in the universe, but few of them existed for a long time. So, Venus and Mars, like Earth, could shelter some 4,000 million years
makes microbial flora or fauna, but this failed to stabilize their changing environment or adapt to changes.
The theory solves a puzzle, said Professor Chopra: the universe abounds in wet and rocky planets, with ingredients and sources of energy to lead life. However, scientists do not have any indication of the possible presence of aliens on those planets.
Conditions such as brightness and distance to the host star, it was always the reference for astronomers to determine the potential for a newly discovered habitable planet, are not so important as previously thought. Its importance can not be compared with the rapid evolution in microorganisms of their ability to regulate the volatility surface.
Astronomers do not believe it is so difficult that there is life elsewhere. The problem has more to do with “feedback loops on planetary surfaces.” Once appeared, organisms or colonies die before someone from Earth becomes aware of his presence.
Over and over living conditions lead to the entire population of the extraterrestrial inhabitants to the bottleneck situation, the authors summarize, going to a popular evolutionary model. Thus biologists describe the drastic declines in the number of members who suffer a population or species under the impact of a regional or global catastrophe.
As a result, copies of post-bottleneck ‘generations have a low genetic variability if not completely disappear. According to the new theory, in most cases the bottle cap closed forever
Source:. RT
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