Signal sparks alien speculation

Air Date: Aug 30, 2016 9:30 PM ET

Signal sparks alien speculation4:12

Extraterrestrial life or merely a cosmic blip? Russians have detected a signal from 100 light years away. Astronomers aren't sure what it is.

Segments

More At Issue
The At Issue Team

More The Insiders
The Insiders Team

More The Bottom Line
The Bottom Line Team

More Rex Murphy