Download Cosmos by Carl Sagan PDF

By Carl Sagan


Cosmos is among the bestselling technology books of all time. In clear-eyed prose, Sagan finds a jewel-like blue global inhabited through a lifestyles shape that's simply starting to realize its personal identification and to enterprise into the monstrous ocean of house. that includes a brand new creation via Sagan’s collaborator, Ann Druyan, complete colour illustrations, and a brand new Foreword via astrophysicist Neil deGrasse Tyson, Cosmos retraces the fourteen billion years of cosmic evolution that experience remodeled subject into attention, exploring such themes because the starting place of lifestyles, the human mind, Egyptian hieroglyphics, spacecraft missions, the demise of the sunlight, the evolution of galaxies, and the forces and people who helped to form sleek science.

Praise for Cosmos
“Magnificent . . . With a lyrical literary sort, and a spread that touches just about all features of human wisdom, Cosmos usually turns out too reliable to be true.”The simple Dealer
“Sagan is an astronomer with one eye at the stars, one other on historical past, and a third—his mind’s—on the human condition.”Newsday
“Brilliant in its scope and provocative in its feedback . . . shimmers with a feeling of wonder.”The Miami Herald
“Sagan dazzles the brain with the miracle of our survival, framed by means of the stately galaxies of space.”Cosmopolitan
“Enticing . . . iridescent . . . imaginatively illustrated.”The ny instances booklet Review

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Extra resources for Cosmos

Sample text

Alexander encouraged respect for alien cultures and the open-minded pursuit of knowledge. According to tradition—and it does not much matter whether it really happened—he descended beneath the Red Sea in the world’s first diving bell. He encouraged his generals and soldiers to marry Persian and Indian women. He respected the gods of other nations. He collected exotic lifeforms, including an elephant for Aristotle, his teacher. His city was constructed on a lavish scale, to be the world center of commerce, culture and learning.

The essence of artificial selection—for a Heike crab, a dog, a cow or an ear of corn—is this: Many physical and behavioral traits of plants and animals are inherited. They breed true. Humans, for whatever reason, encourage the reproduction of some varieties and discourage the reproduction of others. The variety selected for preferentially reproduces; it eventually becomes abundant; the variety selected against becomes rare and perhaps extinct. But if humans can make new varieties of plants and animals, must not nature do so also?

His city was constructed on a lavish scale, to be the world center of commerce, culture and learning. It was graced with broad avenues thirty meters wide, elegant architecture and statuary, Alexander’s monumental tomb, and an enormous lighthouse, the Pharos, one of the seven wonders of the ancient world. But the greatest marvel of Alexandria was the library and its associated museum (literally, an institution devoted to the specialties of the Nine Muses). Of that legendary library, the most that survives today is a dank and forgotten cellar of the Serapeum, the library annex, once a temple and later reconsecrated to knowledge.

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