Everything thatour civilisation has achieved, is a productofhuman intelligence, fromlearning to master fire, tolearning to grow food, to understanding the cosmos.
He also suggested that the potential threats posed by contact with alien intelligence should discourage us from actively sending out messages to the cosmos.
He conducted the first radio search for extraterrestrial intelligence and helped construct the Voyager interstellar record, which carried pictures and music from Earth out into the cosmos.