As science continues to search the cosmos for evidence of intelligent extraterrestrials and, at the very least, for habitable planets that might harbor even non-intelligent life, one scientist is raising another eye-opening question: Was there a time in the far distant past when an advanced civilization actually lived on one of the planets of our solar system, long before earthlings evolved?
Pennsylvania State University astrophysicist Jason T. Wright suggests that ancient aliens may have lived on nearby planets hundreds of millions of years ago, before vanishing without a trace.
In a new scientific paper, "Prior Indigenous Technological Species," published in Cornell University's research archive, ArXiv, on April 24, Wright speculates:
One of the primary open questions of astrobiology is whether there is extant or extinct life elsewhere in the solar system. Implicit in much of this work is that we are looking for microbial or, at best, unintelligent life, even though technological artifacts might be much easier to find.
But if a prior technological, perhaps spacefaring, species ever arose in the solar system, it might have produced artifacts or other technosignatures that have survived to present day.
Here, I discuss the origins and possible locations for technosignatures of such a prior indigenous technological species, which might have arisen on ancient Earth or another body, such as a pre-greenhouse Venus or a wet Mars.