"Should be" in this case seems to indicate only opinion, not a predictive and falsifiable hypothesis based on observation. It "feels" like it should be true; This is not a useful viewpoint in science. Why assume that older civilizations are more expansive than young ones?
Originally Posted by kzb
STARGAZING: All I see are the lights of a billion places I'll never go. --Howard Tayler, Schlock Mercenary
"It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change." Charles Darwin
"It is the duty of the writers to seduce me into suspending my disbelief!" Paul Beardsley