In 1980, his 13-part PBS series Cosmos sparked our curiosity and dazzled our imaginations about all the incredible possibilities of the universe. Sagan made us look up and dream. A respected scientist in biology and astrophysics , Sagan discovered that the atmosphere of Venus is extremely hot and dense. Always an outspoken believer of extra-terrestrial life, he worked with NASA on the Mariner, Viking and Voyager exploration missions. There is no reason to think that the evolutionary process has stopped.
Man is a transitional animal.
Speculations on the Evolution of Human Intelligence . They laughed at the Wright Brothers . But they also laughed at Bozo the Clown. There is no end to the possibilities of the universe.