What if an extra-terrestrial force attacked Earth? What might that look like and how will the people of Earth respond? Consulting a cast of world-renowned scientists, survival experts and defense experts, National Geographic explores this frightening scenario. Experts reveal what could motivate alien invaders to attack Earth, and speculate on how the attack might play out, the strategy alien invaders might use, and the most effective ways for humans to respond.

For centuries, mankind has looked to the skies and wondered, “are we alone in the universe?” In one month SCIENCE partners with TED and SETI Institute (Search for Extraterrestrial Intelligence), to enlist like-minded individuals everywhere to tackle this defining question with ARE WE ALONE?, a breakthrough multimedia initiative. ARE WE ALONE? is timed to support a major new resource called SETI Live which will empower and mobilize “citizen scientists” from all walks of life to join the search for extraterrestrial intelligence.