The astronomer said why scientists have not yet found aliens
Oct 21, 2017 6:49:39 GMT
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Post by Διαμονδ on Oct 21, 2017 6:49:39 GMT
Humanity has still not made contact with extraterrestrials or did not find traces of extraterrestrial life, for the reason that most of the potentially habitable planets, is likely to be water worlds, covered with ice, said Alan Stern, head of the New Horizons mission, at the annual conference planetological DPS in the American Provo.
"The worlds oceans are one of the most ideal environments for the emergence of life. Conditions in the waters of such planets almost do not depend on, around which stars they orbit, how far they are from them and how long left to live such a star. They are not threatened by a supernova, meteorite impact, sudden climate changes and other events that can destroy life on Earth," explains Stern.
More than half a century ago, the American astronomer Frank Drake developed a formula for calculating the number of civilizations in the Galaxy with whom contact is possible, trying to estimate the chances of detection of extraterrestrial intelligence and life.
Physicist Enrico Fermi in response to a high estimate of the chances of interplanetary contact the Drake equation was formulated the thesis, which is now known as the Fermi paradox: if extraterrestrial civilizations so much, then why the mankind does not observe any traces of them?
This paradox, scientists have tried to solve in many ways, the most popular of which is the hypothesis of a "unique Earth". She suggests that for the emergence of intelligent beings unique requirements, in fact, a full copy of our planet. Other astronomers believe that we can't communicate with the aliens, for the reason that galactic civilization or disappear too quickly, so we could notice them, or because they actively conceal their existence from humanity.
Stern offered his own explanation of this phenomenon, which does not require the existence of galactic "kamarali" races or justification of the uniqueness of the Earth.
Studying the lists of recently discovered exoplanets that are within the "zone of life", a special region of the orbit where water can exist in liquid form, a planetary scientist from NASA drew attention to the fact that a planet is similar in size to Earth, are rocky celestial bodies, and oceanic worlds. They can be completely covered with liquid water and a crust of ice, beneath which lies a subglacial ocean, like those that are on the moons of Saturn and Jupiter.
This observation made him think about how often life can arise on such planets that will influence the likelihood of its origin, and as such aquatic life forms can establish contact with humanity.
As shown by his calculations, similar planet-the oceans, is covered with a thick crust of ice, should be much more friendly to the emergence and development of life than the "open" of the planet, similar to Earth. As suggested by Stern, if extraterrestrial life exists, it likely dwells in the depths of such water worlds.
"The inhabitants of these worlds will not even suspect that in the Universe there are stars, space and other planets. The closest equivalent of our space program for them to be out on the surface of their watery world. Therefore, neither we nor they will not suspect about existence each other," concludes the scientist.
ria.ru/science/20171020/1507245036.html
"The worlds oceans are one of the most ideal environments for the emergence of life. Conditions in the waters of such planets almost do not depend on, around which stars they orbit, how far they are from them and how long left to live such a star. They are not threatened by a supernova, meteorite impact, sudden climate changes and other events that can destroy life on Earth," explains Stern.
More than half a century ago, the American astronomer Frank Drake developed a formula for calculating the number of civilizations in the Galaxy with whom contact is possible, trying to estimate the chances of detection of extraterrestrial intelligence and life.
Physicist Enrico Fermi in response to a high estimate of the chances of interplanetary contact the Drake equation was formulated the thesis, which is now known as the Fermi paradox: if extraterrestrial civilizations so much, then why the mankind does not observe any traces of them?
This paradox, scientists have tried to solve in many ways, the most popular of which is the hypothesis of a "unique Earth". She suggests that for the emergence of intelligent beings unique requirements, in fact, a full copy of our planet. Other astronomers believe that we can't communicate with the aliens, for the reason that galactic civilization or disappear too quickly, so we could notice them, or because they actively conceal their existence from humanity.
Stern offered his own explanation of this phenomenon, which does not require the existence of galactic "kamarali" races or justification of the uniqueness of the Earth.
Studying the lists of recently discovered exoplanets that are within the "zone of life", a special region of the orbit where water can exist in liquid form, a planetary scientist from NASA drew attention to the fact that a planet is similar in size to Earth, are rocky celestial bodies, and oceanic worlds. They can be completely covered with liquid water and a crust of ice, beneath which lies a subglacial ocean, like those that are on the moons of Saturn and Jupiter.
This observation made him think about how often life can arise on such planets that will influence the likelihood of its origin, and as such aquatic life forms can establish contact with humanity.
As shown by his calculations, similar planet-the oceans, is covered with a thick crust of ice, should be much more friendly to the emergence and development of life than the "open" of the planet, similar to Earth. As suggested by Stern, if extraterrestrial life exists, it likely dwells in the depths of such water worlds.
"The inhabitants of these worlds will not even suspect that in the Universe there are stars, space and other planets. The closest equivalent of our space program for them to be out on the surface of their watery world. Therefore, neither we nor they will not suspect about existence each other," concludes the scientist.
ria.ru/science/20171020/1507245036.html
