Stories by Carl Sagan

The earth remains the only inhabited world known so far, but scientists are finding that the universe abounds with the chemistry of life

Presenting an issue on what is known about the sun and the bodies In orbit around it, with special reference to the knowledge gained In 18 years of exploration by space probes launched from the earth

There can be little doubt that civilizations more advanced than the earth’s exist elsewhere in the universe. The probabilities involved in locating one of them call for a substantial effort