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Indeed, Sagan's most popular work of fiction ''Contact'', later made into a movie, was about finding extraterrestrial life.

Indeed, Sagan's most popular work of fiction ''Contact'', later made into a movie, was about finding extraterrestrial life.

To Sagan, there was nothing beyond physical reality.

To Sagan, there was nothing beyond physical reality as can been by his atheistic claim:

{{Cquote|The cosmos is all that is, or ever was, or ever will be."<ref>Cosmos series, 1980</ref>}}

Professor Sagan would slip in a subtle pitch for [[disarmament]] as he proclaimed his devotion to finding extraterrestrial life:

 

{{Cquote|We have looked close-up at dozens of new worlds. Worlds we never saw before. And unless we are so stupid to destroy ourselves, we are going to be moving out to space in the next century," he said. "And if I'm fortunate enough to have played a part in the first preliminary reconnaissance in the [[solar system]], that's a terrifically exciting thing.<ref>[http://www.cnn.com/US/9612/20/sagan/ Quarles]</ref>}}

Professor Sagan would slip in a subtle pitch for [[disarmament]] as he proclaimed his devotion to finding extraterrestrial life:<ref>[http://www.cnn.com/US/9612/20/sagan/ Quarles]</ref>

 

:"We have looked close-up at dozens of new worlds. Worlds we never saw before. And unless we are so stupid to destroy ourselves, we are going to be moving out to space in the next century," he said. "And if I'm fortunate enough to have played a part in the first preliminary reconnaissance in the [[solar system]], that's a terrifically exciting thing."

He often made his opposition to nuclear weapons clear.  An episode of Cosmos, "Who Speaks for Earth," dealt with the possibility of nuclear annihilation explicitly.

He often made his opposition to nuclear weapons clear.  An episode of Cosmos, "Who Speaks for Earth," dealt with the possibility of nuclear annihilation explicitly.