Mark Moffett

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.

Photographer Michael "Nick" Nichols has a clear philosophy: "I invest a lot of time in a story, but little to make the job easy for me." He spent a year photographing a 330-foot-tall redwood tree with special cameras—no one else had been able to do that before. The resulting film documentation is an impressive testimony to the latest photo technology and an extraordinary passion.