What is an astrobiologist's view of the question 'Are aliens really present?'
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Helen Sherman, who went to space for the first time as a British in 1991, stated in an interview conducted on January 7, 2020 that ' aliens exist, there is no other way ' . Samantha Rolf, a professor of astrobiology at the University of Hertfordshire , explains the true meaning of this statement.
Could invisible aliens really exist among us? An astrobiologist explains
https://theconversation.com/could-invisible-aliens-really-exist-among-us-an-astrobiologist-explains-129419
In an interview with a British observer, Sherman said, 'There are aliens, nothing else. There are billions of stars in this universe, and all kinds of' life ' Must be there, are aliens like you and me, carbon and nitrogen-like organisms, maybe not, aliens could just be here right now, and if we were, I just can't find it. ' According to Rolf, the remarks made by the chemist, Sherman, referred to a biochemical debate called the ' shadow biosphere .'
The shadow biosphere is a collective term for living organisms that have completely different biochemical mechanisms than known living organisms. Since such organisms have not been discovered, their existence is merely a 'hypothesis', but the theory that microorganisms exist that exceed human understanding of biochemistry has long been advocated.
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The reason is that 'only a few species of microorganisms can be cultured in the laboratory by humans.' According to Rolf, it is possible to analyze genetic information even for microorganisms that cannot be cultured, but microorganisms whose presence can be estimated using this method are limited to those that have 'DNA'. Therefore, there is always the possibility that 'microorganisms without DNA' have not been detected by humans.
It is ' silicon organisms ' that have been discussed about its existence. Life on Earth is composed mainly of carbon, which is attributed to the fact that carbon has four valences and can form various bonds. It has been said that silicon (silicon) with the same logic and the same four valences as carbon could constitute a completely different type of organism from the ones discovered so far. .
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According to Rolf, `` Silicon and carbon have a similar bonding mode, but silicon with 14 protons is heavier than carbon with 6 protons, and has a stronger strength such as double bonds and triple bonds. It is not suitable for high binding, which makes silicon long-chain molecules unstable. ' In addition, Rolf pointed out that as a problem when thinking that 'silicon organisms occur on the ground', 'most of the silicon on the earth exists in the ground'. Therefore, if silicon life exists, the fact that 'it came from outside the earth' will be rich.
Mr. Rolf said, `` I do not think that there is an alien that has achieved interstellar movement, but it is possible that life belonging to the shadow biosphere has reached the earth by meteorites, '' he said, 'Life that goes beyond the framework of' 'should be investigated, and that such life should be protected if found.
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