Statistically speaking, we are probably not alone in the universe. Given the abundance of stars that likely host Earth-like planets with liquid water, life, and a temperate atmosphere, alien civilizations may have already emerged, flourished, and traveled through interstellar space.
If so, then we may not have to populate distant worlds to meet them. They may try to contact us.
A declassified National Security Agency document shows how some of the world’s leading scientists believe an alien intelligence might attempt to make contact with the human race.
With the development of human-made technologies, new ways are increasing in which an intelligent alien species can make contact with humanity through the abyssal depths.
More and more scientists agree that contact with alien civilizations may be part of our social evolution, as natural as our accidental discovery of radioactivity or our first steps on the moon.
It is “no longer something beyond our dreams, but a natural event in human history that will probably occur in the lifetime of many of us,” according to a declassified article on the NSA website.
The Milky Way galaxy contains at least 100 billion stars. According to NASA research, there may actually be about 400 billion stars.
Periodically repeating laser pulses may be the best means of interstellar communication, since they can cover unspeakably long distances.
Another method involves moving the stars in an easily recognizable geometric pattern that would instantly signal to any observer: Please note, this is not created by nature!
“They could build something that could be seen from a huge distance across the galaxy, or even from another galaxy, which would be clearly artificial,” said astrobiologist David Grinspoon of the Planetary Science Institute.
Some astronomers believe that alien megastructures in the universe could be a message that life exists there.
However, the most well-known theory of megastructure is likely to be star dimming rather than interstellar SOS.
Research in 2019 suggested that the “blinking” star could be caused by the destruction of an exoplanet in the foreground.
Conventional radio is quite reliable when making interstellar contact. Radio waves have served as scientists’ primary means of listening to alien signals for nearly a century.
Radio waves are incredibly resilient, passing unhindered through the darkest depths of the galaxy. They are reliable, although they spread slowly. Radio waves travel at the speed of light. For example, if the nearest star is more than four light years away, the answer will take eight years.