Alien signals can be too complicated for us

"Each of these stars may have New York, Paris, London, and we do not even know that," says Nate Tellis of the University of California in Berkeley, commenting on the 5,600 stars analysis performed by the Keck Observatory in Hawaii, which houses one of the most powerful telescopes in the world last year. Tellis, searching for laser beams, powerful flashes of photo beams that live some nanoseconds, asks an important question: could there be anything special about these data, any signal of a reasonable civilization sent to earth?

Astronomers analyze the data from the Keck Observatory and Kepler's mission and find more and more terrestrial planets that rotate in other stars. At the same time, chances are that something interesting can be displayed on one of these planets.

Imagine another kind of life in a distant world that is also seeking laser light, says Tellis. "If we sent our telescope to Earth from a distance, we would not have seen what people do either. Because Earth does not send laser beams to the universe, it signals the existence. Why should other worlds do this?"

Astronomers at the Keck Observatory spend hours watching the night sky looking for exoplanets and collecting huge amounts of data about potential new worlds in the Milky Way. Tellis, along with astronomer Jeff Marcy, dived into Keck data archives with 67,000 studied spectra from 2004 to 2016. They armed with a data algorithm that discovered lasers that fought all the data on starlight items from 10m Keck and high resolution spectroscopy. Laser emission lines generated by unnatural sources may differ from natural astrophysical sources by monochromism. The algorithm identified 5000 interesting objects that require further studies. Then, Tellis and Marcy analyzed them manually and eliminated anything but 12 signals.

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Tellis and Marci were able to rule out the signs of laser signals from all the spectra that were studied. "We have not found convincing evidence of alien laser radiation among all 5,600 stars with a power level of 3 kW to 13 MW." These results will help limit the possibilities for deploying intelligent civilians.

Based on the speed at which astronomers have discovered earth planet planets on star paths, Tellis and Marcy have calculated the number of planet-based planets that they need to explore. "Since these star systems contain about 2,000 terrestrial planets, we exclude Melky Way models, where more than 0.1% of hot-earth planets contain technological civilizations that are deliberate or do not send us laser beams."

In short, if technological civilizations only appear on 1% of such earthly planets, the study by Tellis and Marcy should have revealed about 20 such civilizations.

There is also the possibility that technological civilizations exist, but for millions of years, more developed, have technologies beyond our reach, or do not want to contact primitive civilians like ours.

"I think when you are looking for alien life, it's important not to be upset because of lack of results," said Tellis. "The search has been going on for 60 years and there are no results, and no and no."

"If you propose to conduct a SETI study at the Keck Observatory for thousands of hours, nobody will give you," says astronomer Jason Wright. Meanwhile, there are a large number of sets of astronomical data waiting to be seen the second time. That for a trash - for another treasure, even if it's a matter of searching for life in the universe. "

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