Researchers who listen for signs of non-human life say signals ‘can slip below detection thresholds, even if it’s there’ Researchers who listen for signs of non-human life say signals ‘can slip below detection thresholds, even if it’s there’ Earth’s leading alien hunters believe extraterrestrials could be out there, they’re just having a hard time getting through to us because it’s stormy in space. Reminiscent of ET’s struggles to “phone home” in Steven Spielberg’s 1982 blockbuster movie , new