"Frank said that the third big question—how long civilizations might survive—is still completely unknown." Interestingly, that might not matter so much - Michi

"Frank said that the third big question—how long civilizations might survive—is still completely unknown." Interestingly, that might not matter so much - Michio Kaku argues that any truly advanced civilization would be essentially immortal, as their technology would have evolved fast enough to deal with global catastrophes: http://mkaku.org/home/articles/the-physics-of-extraterrestrial-civilizations/ http://mkaku.org/home/articles/the-physics-of-extraterrestri...