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.
James Lurie
Seth Shostak
Nick Pope
Brian De Toy
Stephen Hawking
Paul Springer
Travis Taylor
Bob Boan
Michael Michaud
Paul Parsons
John Ringo
Mark Moffett
Dirk Schulze-Makuch
Neil Strauss
Kevin Reeve
Quay Terry
Bill Brown
Elise Cantu
Carin Chea
Zee Cruise
Leandro DiMonriva
Kenneth Favell
Philip Hersh
Sydney Jay
Christopher Clay Jones
Matt Lasky
Eric Raymond Lim
Desiree Martin
Tiffany Martinez
Richard Miraan
Jose Rosete
David Schlachtenhaufen
Christopher Warren
Avihai Yaffe
Justin Cuomo