The first unmistakable signal from another intelligence may not be a cheerful greeting. A growing group of researchers is ...

Rebecca Charbonneau is a historian at the American Institute of Physics, College Park, Maryland, and the author of Mixed Signals: Alien Communication Across the Iron Curtain. As the electronic signals ...

The first unmistakable signal from another intelligence would rank alongside fire and writing in the story of our species, yet a growing group of researchers warns that such a moment might arrive not ...