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Searching Earth for signs of historical extraterrestrial presence

Paul Davies (credit: ASU)
SETI (Search for Extraterrestrial Intelligence) astronomers have been scanning the skies for extraterrestrial signals for more than fifty years. But one scientist suggests launching a new approach that could complement SETI’s efforts in the search for extraterrestrial life.

Astrobiologist, physicist, and cosmologist Paul Davies has cooperated with SETI for thirty years, but believes scientists might have better luck finding evidence of extraterrestrial life here on Earth. According to Astrobiology Magazine, “Davies wants scientists to broaden their

The Allen Telescope Array (credit: SETI Institute)
thinking about how aliens could have left behind their mark.” He suggests that scientists should search our own planet for possible “footprints” left behind by ancient extraterrestrial visitors, “or even analyze the DNA of terrestrial organisms for signs of intelligent messages or tinkering.” He explains that it is possible that intelligent extraterrestrials visited Earth long ago, and therefore there could be evidence of their visit, but “probability and the length of the universe’s age suggest that any such alien visit would have taken place before humans ever emerged on Earth.”

The evidence could be on our very own planet. We just have to find it. That is, if any traces of extraterrestrial visitation have survived for “hundreds of millions or billions of years for humans to still find them today.”

Davies feels that the search for evidence of extraterrestrial life here on Earth would complement SETI’s skyward efforts, even though he acknowledges that using radio telescopes to listen for alien signals is like searching for a needle in a haystack.

Jason McClellan

Jason McClellan is a UFO journalist and the producer/co-host of the web series Spacing Out! He is also the web content manager and staff writer for OpenMinds.tv, and a co-organizer and technical producer of the International UFO Congress. As a founding member of Open Minds, Jason served as a writer and editor for the now defunct Open Minds magazine. He has appeared on Syfy, NatGeo, and, most recently, he co-starred on H2's Hangar 1: The UFO Files. ------ Follow Jason on Twitter @acecentric and subscribe to Jason's updates on Facebook.

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