Home > Astronomy, Exobiology, General Astronomy, Solar System > Nonterrestrial Artifacts Hard to Pin Down

Nonterrestrial Artifacts Hard to Pin Down


Two Pioneer probes left our solar system carrying plaques about humankind, and two Voyager probes will soon join them to gather information about places far out in our galaxy. We can and will send more autonomous probes into outer space, but why have we never found evidence of other civilizations doing the same? A pair of postdoctoral researchers at Penn State, approaching the problem mathematically, shows that we have not looked in enough places to ensure that no extraterrestrial artifacts exist in our solar system.

“The vastness of space, combined with our limited searches to date, implies that any remote unpiloted exploratory probes of extraterrestrial origin would likely remain unnoticed,” report Jacob Haqq-Misra, Rock Ethics Institute, and Ravi Kumar Kopparapu, Earth and Environmental Systems Institute, in a paper accepted by Acta Astronautica and posted online on ArXiv.

So far, we have not found any nonterrestrial artifacts in our solar system. The Fermi paradox, originally formulated by Enrico Fermi, asks, if intelligent life is common, why have no technological civilizations been observed. Answers to this question could include life is rare, intelligent cultures inevitably destroy themselves, intelligent beings have not gotten here yet or they are here but not revealing themselves. Even without actual contact, like us, other civilizations could be sending unpiloted probes to quietly peek at our civilization.

Full Story: http://live.psu.edu/story/56240

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