Скачать или смотреть क्या Advanced Alien Technology ख़त्म कर देगी धरती पर जीवन? | ये Oumuamua क्या है? Oumuamua in Hindi

Humans’ “first contact” with aliens is likely to be with a civilization much more technologically advanced than ours, according to a new NASA-funded study into the search for intelligent extraterrestrial life (SETI). 

According to the paper published in the specialized journal Acta Astronautica, the easiest way to detect extraterrestrial civilizations is by searching for “technosignatures”—evidence for the use of technology or industrial activity in other parts of the Universe. 

example, the presence of nitrogen dioxide—as studied recently by the same team of researchers—or the wholly artificial chlorofluorocarbons (CFCs), both of which are evidence for there being a technologically advanced civilization on Earth. 

Large swarms of satellites around a planet.

Gigantic space engineering around exoplanets, such as heat shields or “Dyson spheres” that harvest solar energy from the local star. 

Crash sites on the Moon or Mars of probes that might have been sent here in a distant past. 
However, the study—which was funded by NASA Goddard’s Sellers Exoplanet Environments Collaboration (SEEC) and the NASA Exobiology program—argues that our search for technosignatures would likely only be successful at finding much more advanced technology than humans can currently create.

“It seems unlikely that civilizations with a relatively low level of technological development would enter into contact with each other, since that would require either very high sensitivities or highly visible engineering,” reads the paper. “Less advanced civilizations lack the sensitivity needed to detect other civilizations unless they have built very large or luminous structures.” 

In short, we don’t yet have instruments sensitive enough to definitively find “another Earth” by detecting an alien civilization outright.

That’s despite huge advances in our astronomical instrumentation in the past decade that have revolutionized the science of discovery and study of exoplanets, which now number 4,000+.

So we’re looking for massive, unmistakable signs of alien civilisations far more advanced that we are.

“The idea of searching for technosignatures draws upon the technology we have on Earth today and possible extensions of our technology into the future,” said Jacob Haqq-Misra, a co-author of the article and chairman of the TechnoClimes 2020 organizing committee. “This does not necessarily mean that any extraterrestrial technology must be like our own, but imagining plausible extensions of our own future is one place to begin thinking of astronomical searches we could actually do to look for possible technosignatures.” 

The study puts forward a plan, and a new way of classifying the technosignatures as a function of their “cosmic footprint”—the relative size scale of a given technosignature in units of the same technosignature produced by current Earth technology. It’s a measure of how easy to see a technosignature might be from a huge distance. The researchers call this an “ichnoscale.” 

Scale and scope is tricky since a search for crashed spacecraft on the Moon could easily be done, whereas a search for Dyson spheres in our galaxy would have a billion potential targets, according to the paper. 


The next generation of telescopes—such as the James Webb Space Telescope (JWST), but many others—will also, for the first time, allow a search for so-called biomarkers, evidence for life on other planets. While characterizing the atmosphere of an exoplanet it will by default detect the presence of, say, CFCs or nitrogen dioxide.



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