The researchers looked at 21 galaxies that emitted a lot of light in the mid-infrared band. They were surprised to see that the radiation from four of these galaxies had been boosted by a factor of ten.
Natural processes explained two of them, but the other two remained unsolved.
Highly sophisticated extraterrestrial civilizations might be found in two distant galaxies. Both galaxies exhibit traces of anomalous activity, which might imply the existence of an extraterrestrial civilization of class III on the Kardashev scale.
“Are we alone in the universe?” is one of humanity’s deepest and most fundamental questions.
The more we study the cosmos, the more galaxies we find. Researchers believe that there are moreover two trillion galaxies in the visible universe as of 2022, according to the calculations.
The Hubble Space Telescope is critical to our knowledge of the cosmos and the number of galaxies that have formed since our universe started 13.7 billion years ago.
The so-called Hubble eXtreme Deep Field is one of the deepest photographs in space. This picture shows the faintest and furthest galaxies ever observed, allowing scientists to see deeper back in time than ever before.
The Hubble Ultra Deep Field is a Hubble Space Telescope picture of a tiny region of space in the constellation Fornax, generated with Hubble data from 2003 and 2004. It showed hundreds of galaxies, both close and far away, making it the most detailed picture of the cosmos ever captured at the time.
Even with this image of around 5,500 galaxies, we are still a long way from knowing the total number of galaxies in our universe.
Is it possible that we are the only ones in the universe? Although we don’t have a definitive answer to this issue right now, we’re getting close.
Honging Chen of China’s National Astronomical Observatory and his colleagues surveyed a portion of the northern sky. Their purpose was to figure out precisely where there were indicators of hyper-advanced extraterrestrial civilizations in this region.
Two galaxies stood out among the 21 they looked at as having unusual properties.
Their findings were detailed in a research published in the Royal Astronomical Society’s Monthly Notices.
Aliens with sophisticated civilizations?
The size of the cosmos is very enormous. It would be foolish to believe that the Earth is the sole planet where life started, given several criteria such as the age of the universe, and the number of stars and galaxies.
Perhaps a society originated someplace in a faraway galaxy, not so comparable to the Milky Way, that evolved over millions of years and exceeded even our best technological accomplishments.
We utilize the Kardashev scale, which was devised by astronomer Nikolai Kardashev in 1964, to determine how sophisticated a prospective extraterrestrial civilization would be.
It enables you to determine the technological level of a hypothetical alien society based on how much energy it uses. Three civilizations are shown on the scale:
Civilizations that fall within the first category.
This is a hypothetical civilization that is technologically evolved enough to harness all of the energy available in its home world.
The second sort of civilization.
The energy of the whole solar system, including the sun and planets, may be harnessed by this prospective society.
The civilization of Type III.
This hypothetical civilization has progressed to the point that it can harness the energy of the whole galaxy.
By constructing hypothetical megastructures known as Dyson spheres, a civilization of the third kind may readily exploit the numerous stars in its galaxy as energy sources. A civilization might gather all of the energy provided by a star in this way.
Sphere created by Dyson.
A Type III civilization may fulfill its expanding energy demands by utilizing thousands of stars in its galaxy rather than millions, allowing it to develop and explore the cosmos.
We might definitely detect remnants of Dyson spheres if a Type III civilization put them around many of its stars in its home galaxy.
This motivated Chen and co-author Michael Garrett to seek any infrared signals that would suggest the existence of these megastructures using the 2-meter LOFAR Two-meter Sky Survey (LoTSS).
They looked at 21 galaxies that had a lot of mid-infrared radiation. Four of these galaxies experienced a 10-fold increase in emission, which surprised them.
“Two of them have been recognized as natural sources — one was an active galactic nucleus and the other was a star-forming galaxy,” Chen explains.
“We don’t know why the other two have such a high mid-infrared to radio ratio.”
According to InVerse, each galaxy’s radio and infrared emissions are correlated. The infrared spectrum is used by galaxies to transmit information about their heat. Chen reveals that the pair has been looking into the mid and far-infrared spectrum as part of their quest for what seems to be extraterrestrial emissions.
Due to mid-infrared waste heat, a Type III civilization will emit surplus mid-infrared radiation, which will disrupt the correlation.
Two galaxies stand out among the 21 and might be potential host galaxies for type II extraterrestrial civilization. The researchers couldn’t figure out what triggered the surge of radiation in the mid-infrared area in both galaxies.
While extraterrestrial civilizations might be to blame, other natural causes such as an extraordinarily rapid rate of star creation or a very luminous galactic center cannot be ruled out.
In the near future, the galaxies ILT J134649.72+542621.7 and ILT J145757.90+565323.8 are expected to be studied. Chen and his colleagues conclude in their report that both galaxies “deserve additional investigation.”
It remains to be known if these galaxies are home to strong and intelligent extraterrestrial civilizations. Future galaxies studies and observations in various spectra could help us answer one of the most fundamental questions that our species has yet to solve.