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Astronomer Carl Sagan was born on November 9, 1934, in Brooklyn, New York. He graduated from the University of Chicago, where he studied planets and explored theories of extraterrestrial intelligence. He was named director of Cornellís Laboratory for Planetary Studies in 1968 and worked with NASA on several projects. An anti-nuclear activist, Sagan introduced the idea of "nuclear winter" in 1983. He wrote one novel, several books and academic papers and the TV series Cosmos, which was reborn on TV in 2014,†before his 1996 death
As one of the great astronomer-writers of the Twentieth Century, Carl Sagan was extraordinarily communicative with the non-scientific public, able and willing to take the time and trouble to break down the mysteries of the universe into comprehensible fragments. The purpose of this book, which can be considered a companion to the acclaimed television series, is to explain what we know about the universe from a cosmological perspective and why we need to know more about it.
Physicists often talk of the unity of the branches of physics: the interrelation and application of mechanics, thermodynamics, electricity and magnetism, and optics to the motion of everything from galaxies to subatomic particles. Similarly, Sagan's major theme is the unity of cosmology with the natural and physical sciences that define what we know about the Earth. Does the stifling, carbon dioxide-choked atmosphere of Venus imply anything about the greenhouse effect on Earth? Was a nearby cosmic explosion called a supernova indirectly responsible for the disappearance of the dinosaurs? What would be the biological consequences for the survivors of a global nuclear war? The answers to these questions are vital to the continuation of life as we know it.