The mystery of signals from the stars: Alien messages become invisible in stellar plasmas

Humanity's quest to discover whether we are alone in the universe has taken on a whole new dimension with a new scientific understanding. The Fermi Paradox, which came to the fore in the 1950s with Enrico Fermi's question, “Where is everybody?” and has remained unanswered to this day, has kept the mystery of why we cannot access traces of intelligent life in the universe alive. However, recent computer-aided modeling has provided an important clue as to why tracking in the cosmos is so difficult.

In a current study prepared by a research team from the SETI Institute, it was determined that radio signals assumed to be sent by extraterrestrial civilizations are significantly distorted in the dense plasma environment around stars. This finding provides an explanation for why no clear “artificial” radio signals have been encountered to date.

SPACE WEATHER SILENCES SIGNALS

In radio astronomy, “narrow-band” emissions stand out as one of the most effective tools for detecting messages from alien civilizations. The fact that such signals are concentrated in a frequency range of only a few hertz and are too specific to have a natural origin indicates that they are the product of intelligent technology. As astronomer Evan Keane of Trinity College Dublin says, “Such clear energy pulses do not occur naturally in the universe.” However, new models have shown that these signals spread almost “like dishwater” under the influence of stellar plasma clouds, charged particles, and coronal mass ejections during their journey through space. These spreading and deforming signals lose their strength, becoming almost imperceptible to receivers on Earth.

CONFIRMED WITH REAL SPACECRAFT DATA

The findings obtained are not based solely on fictional simulations. Researchers examined the data transmission of the Mariner IV, which reached Mars in the 1960s, and the Viking probes, which traveled beyond the Solar System in 1977. Proving how spacecraft signals are deformed while passing through interstellar plasma has also lent accuracy to models regarding other star systems in the galaxy.

Analyses conducted on red dwarf star systems revealed that the aggressive “space weather conditions” prevailing around such stars might be the real culprit. In M dwarf stars, which have existed since the beginning of the universe and make up the vast majority of stars in our galaxy, technological signals from exoplanets are distorted so strongly that they become almost completely unrecognizable.

NEW ALGORITHM FOR NEXT-GENERATION TELESCOPES

Emphasizing the importance of the study on the astrophysics front, Michael Garrett, Professor of Astrophysics at the University of Manchester, stated, “Decades of observational data and simulations show that we now need to radically renew our signal processing algorithms.” The new mathematical method developed by the research team can predict both the frequencies of the signals and how much they will spread depending on the plasma density in the stars' orbits.

Andrew Siemion, Director of the Breakthrough Listen Oxford Hub, shared the view that, “This paper offers a new way to evaluate with medical precision whether a weak signal from an exoplanet belongs to an alien civilization.”

It is predicted that when this new framework is applied in conjunction with giant radio telescope arrays such as the SKA-Low (Square Kilometre Array), which is currently being installed in South Africa and Australia, our chances of breaking the cosmic silence will increase. Experts hold out hope that messages from alien civilizations may soon be revealed using these new signal processing techniques.

News Source: 12punto