Aliens could connect with humans through high-frequency signals, claimed the National Security Agency (NSA).

A declassified document titled "Communication with Extraterrestrial Intelligence" from NSA explained different methods extraterrestrials could use to communicate with human beings, reported The Sun.

According to the NSA, one way aliens could reach out to humans is through a signal with a frequency of 1420.405752 megacycles per second and a wavelength of 8.26 inches. Atomic hydrogen "permeates space in great clouds," and has this radiation frequency, which can go through the atmosphere of our planet. This form of communication would likely be understood by advanced civilizations that are familiar with radio frequencies.

An NSA document said that humans "are not alone in the universe." NSA noted that a few years ago, this notion seemed farfetched, but today, the existence of "extraterrestrial intelligence is taken for granted by most scientists." The NSA cited the National Academy of Sciences' opinion that communication with other civilizations "is no longer something beyond our dreams." It is "but a natural event in the history of mankind that will perhaps occur in the lifetime of many of us."

The NSA document also mentioned popular astronomer Bernard Lovell's calculation that at least 100 million stars in our galaxy can help in organic evolution. The closest solar system to ours, Alpha Centauri, has planets that are too young to host life, said NASA'S Dr Su-Shu Huang. But solar systems like Epsilon Eridani and Tau Ceti that are more than 100 light-years away from Earth are potential candidates for harboring life.

The NSA document said that nevertheless, if "superior civilizations are abundant, the nearest would probably be at least 100 light-years away. Therefore it would take 200 years for a reply to be forthcoming, a small matter of seven generations."

But finding extraterrestrials isn't easy, especially because they might be jetting between star systems. According to Inverse space writer Passant Rabie, for a very "advanced alien civilization,” interstellar travel would “not only be possible but also necessary.” Rabie noted that star system-hopping is essential since our sun will eventually "run out of hydrogen and dim, making it impossible to sustain life on the planets around it."

Representation Image Humanoid alien figure Pawel86 / Pixabay

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