Cosmos is a Greek word for the order of the universe. It is, in a way, the opposite of Chaos. It implies the deep interconnectedness of all things. It conveys awe for the intricate and subtle way in which the universe is put together.
"As a scientist, I see through space technology an aperture to a very desirable future. Just think of what we are doing. We have four spacecraft that are leaving the solar system bound for the stars. We have landed on the planet Mars. It is astonishing. And yet there has never been better reason for nervousness because the same technology—rocketry—can be used to send nuclear weapons halfway around the planet. It’s a kind of classic morality play. You can imagine God saying, "I set before you this power. You can use it to destroy yourselves or to take you to the stars. It’s up to you." — Carl Sagan on nuclear war/weapons, and the future [May 19, 1986 ‘People Magazine’ interview, recently after Chernobyl]