Why Our First Alien Encounter Could Happen Soon - National Geographic

National Geographic
Why Our First Alien Encounter Could Happen Soon
National Geographic
Kepler-186f, pictured here in an artist's concept, is the first Earth-size planet to be discovered in a star's habitable zone. Illustration by NASA Ames/JPL-Caltech/T. Pyle. By Simon Worrall. PUBLISHED November 20, 2016. It's one of the great questions ...and more »