Overview
Carl Sagan takes readers on an awe-inspiring journey through the universe, interweaving astronomy, biology, history, and philosophy.
Sagan's 1980 book was the companion to his thirteen-episode television series of the same name. The book and show together reached more than five hundred million people and are widely credited with inspiring a generation of scientists. Sagan was an unusually gifted communicator — he wrote poetically without surrendering scientific accuracy, and the book has aged extraordinarily well despite four decades of discoveries.
Key Ideas
Cosmic perspective humbles
The Earth is a tiny pale blue dot in an incomprehensibly vast universe.
We are starstuff
Every atom in our bodies was forged in ancient stars.
Science is a candle in the dark
Skeptical inquiry is humanity's most reliable tool for understanding reality.
Who should read this
Anyone curious about the universe but intimidated by technical physics. Cosmos moves from astronomy to biology to the history of science, and Sagan's genuine wonder at the subject is contagious. Particularly good for teenagers and young adults, and a book many scientists still cite as their first inspiration.
Who might skip it
Skip only if you want the absolute latest astrophysics; Sagan wrote before the discoveries of exoplanets, dark energy, gravitational waves, and much of modern cosmology. The 2013 Neil deGrasse Tyson reboot of the TV series updates much of this, but the book has an original voice that reboots can't quite match.
The verdict
A book I reread every few years, not for the science but for the voice. Sagan's humanism — the sense that humility about our place in the cosmos is a moral as well as intellectual achievement — is the thing I most wish we had more of in contemporary public life. A book to read slowly and keep.
"The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself."
— Carl Sagan, Cosmos
If you liked this
Pale Blue Dot for Sagan's more overtly philosophical sequel. The Demon-Haunted World for his best book on scientific reasoning.