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Aliens May Have Existed On Earth. Here's Why They Left

It is one of humanity's most all-consuming questions, intriguing researchers, governments and pop culture alike.  But now, one US space scientist is claiming that advanced life forms may be a reality - but that they vanished long ago.

Professor Jason Wright, an astrophysics and astronomy professor at Pennsylvania State University, published a paper in arXiv entitled 'PriorIndigenous Technological Species'.

He claims that ancient 'technological species' may have lived on Earth billions of years before the human race. Well, either Earth, or a "pre-greenhouse Venus," or "a wet Mars". He is not 100 % sure.

However, Wright claims:
Given that it is known to host complex life, the clearest origin for a prior species of any kind is Earth.

He pulls no punches when he explains that:
Present-day Venus would seem to be a dreadful 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.

Wright believes that the ancient species has disappeared, but that in the past we could have found traces of them underground, called "techno signatures".  However, he claims that most of the physical proof 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 erased any lingering traces. Nevertheless, he writes, it might still be possible to recognize these techno signatures even if the physical evidence is all but damaged.

He explains:
Structures submerged beneath surfaces might last and be discoverable as long as they do not suffer a collision so plain that their artificial nature is destroyed. Merely finishing them would reduce them nonfunctional, but they might still be identifiably technological. We might guesswork that settlements or bases on these objects would have been built under the surface for a variation of reasons, and so still be discoverable today.

Wright proposes that we might find hints on more uninterrupted surfaces such as the Moon and Mars. Of course, the idea that humans are not the only emotional species is nothing new.

Indeed, he writes, "the idea of indigenous Martian civilizations pervades science fiction to the point of cliché".

However, the proposal that the alien species is already extinct is comparatively unexplored in the scientific field.  But why does Wright think they disappeared? Wright says that "the most obvious answer" is a cataclysm, "whether a natural event such as an extinction-level asteroid impact, or self-inflicted, such as a global climate catastrophe".

However, in the case of a species which had settled in the Solar System, Wright explains:
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.

Source: [DailyMail, Independent]  

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