If intelligent life types exist beyond Earth, they likely know we’re here, a NASA official mentioned right now at the Astrobiology Science Conference in Chicago.
“We put atmospheric signatures that guarantee an individual with a massive telescope 20 light years away could detect us,” stated John Grunsfeld, associate administrator for NASA’s Science Mission Directorate. “If there is life out there, intelligent life, they’ll know we’re here.”
Grunsfeld, a former astronaut, pointed to alterations that life on Earth has produced in the atmosphere as one of the telltale signs intelligent life could spot Earthlings from afar.
“‘Are we alone?’ is the most significant driving query,” Grunsfeld stated.
NASA’s chief scientist Ellen Stofan stated in April that she believes the initial indications of alien life could come by 2025 — with far more concrete evidence of extraterrestrial life coming in 20 to 30 years.
When Stofan predicts mankind is most likely not alone in the universe, she stated at a panel discussion about water in the universe she expects alien life won’t be “little green guys.”
“We are talking about little microbes,” she stated.