Radau labai įdomų straipsnį (by Michio Kaku; nesijuokiam iš pavardės) apie nežemiškų civilizacijų fiziką ir vystymosi specifiką. Skaitinys angliškai, bet labai rekomenduoju. Štai ištrauka:
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The Physics of Extraterrestrial Civilizations
How advanced could they possibly be?The late Carl Sagan once asked this question, “What does it mean for a civilization to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical civilization is a few hundred years old... an advanced civilization millions of years old is as much beyond us as we are beyond a bush baby or a macaque.”
http://www.mkaku.org/articles/physics_of