The Physics of Extraterrestrial Civilizations

03/11/2013 18:32

by Michio Kaku
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.” [Read more] ...