ALIENS may have once lived on early Earth, a US space expert has bizarrely claimed in a newly-unearthed research paper.
The astronomer announced in 2017 advanced alien life forms really could have once existed on Earth. Jason Wright, an astronomy and astrophysics professor at Pennsylvania State University, published a paper in arXiv entitled Prior Indigenous Technological Species.
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In the paper, he revealed an alien “technological species” may have lived on ancient Earth, a “pre-greenhouse Venus” or “a wet Mars”.
Given that it is known to host complex life, the most obvious origin for a prior species of any sort is Earth
Professor Wright said: “Given that it is known to host complex life, the most obvious origin for a prior species of any sort is Earth.
“Present-day Venus would seem to be a terrible candidate for a technological species, with a surface temperature over 700K.
“Although when it comes to alien life we should keep an open mind about even this.”
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The astronomy expert added that although the ancient aliens may have left the planet, evidence of the existence called “technosignatures” may have survived underground.
However, he admitted most of the physical evidence would now be lost.
On Venus, for example, the global greenhouse arrival may have resulted in a resurfacing of the planet.
While on Earth the movement of tectonic plates and subsequent erosion could have destroyed any remaining evidence.
The researcher did suggest, however, it might still be possible to recognise such technosignatures even if the physical evidence is destroyed.
He said: “Structures buried beneath surfaces might survive and be discoverable as long as they do not suffer a collision so severe that their artificial nature is obliterated.
“Merely destroying them would render them nonfunctional, but they might still be recognisably technological.
“We might conjecture that settlements or bases on these objects would have been built beneath the surface for a variety of reasons, and so still be discoverable today.”
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One option may be to search for traces on more undisturbed surfaces on other bodies in the solar system.
His controversial proposal about an extinct alien species is comparatively unexplored in the scientific field.
The astronomer believes “the most obvious answer” for the alien race’s disappearance was a cataclysm, “whether a natural event such as an extinction-level asteroid impact, or self-inflicted, such as a global climate catastrophe”.
But in the case of a species which had settled in the elsewhere in the solar system, Professor Wright said: “Such an event would only permanently extinguish the species if there were many cataclysms across the solar system closely spaced in time (a swarm of comets, or interplanetary warfare perhaps), or if the settlements were not completely self-sufficient.
“Alternatively, an unexpected nearby gamma-ray burst or supernova might produce a Solar-System-wide cataclysm.
“Even without a cataclysm, the species may have simply died out, or become permanently non-technological at some point, or […] abandoned the solar system permanently for some reason.”
The recently-unearthed research paper coincided with the publication of a study into the Fermi Paradox suggesting humans will likely never find aliens.
A team of researchers at the University of Oxford released a paper attempting to finally crack the Fermi Paradox — the discrepancy between our expected existence of alien signals and the universe’s apparent lack of them.
Using fresh statistical methods, the 2018 paper arrived at some startling conclusions: Humans are not only likely to be the sole intelligence in the Milky Way, but there is about a 50 percent chance we are alone in the entire observable universe.
Specifically, based upon the current state of astrobiological knowledge, there is a 53 to 99.6 percent chance we are the only civilisation in this galaxy.
And there is a 39 to 85 percent chance we are the only one in the observable universe.
The finding suggests life as we know it is incomprehensibly rare, and if other intelligence exists, it is probably far beyond the cosmological horizon and therefore forever invisible to us.
Sourse: www.express.co.uk
