We’re used to the idea of searching for space aliens by scanning the heavens for their radio signals — after all, that’s what Jodie Foster's character does in the 1997 movie Contact and the way alien hunters commonly go about their work. But some scientists think the search for extraterrestrial intelligence (SETI) shouldn’t be limited to far-flung star systems. Rather, they argue, we should consider the possibility that evidence of intelligent aliens might exist here on Earth, or on one or more of our nearest neighbors in the solar system. These scientists aren’t saying aliens might be living among us now. They’re raising the possibility that another intelligent species lived or visited our cosmic neck of the woods millions or billions of years ago and left behind so-called “technosignatures” — things like radios, rockets, or other examples of advanced technology — that might yet exist deep underground or out in space. read more https://www.nbcnews.com/mach/science/should-we-be-looking-space-aliens-bit-closer-home-ncna796841
