Murmurs of Earth

While not explicitly named in the transcript, the context strongly suggests that "Murmurs of Earth" is a book about Carl Sagan's work on the Golden Record.

It likely details the creation, content, and significance of the Voyager Golden Record, a time capsule of human culture and knowledge sent into space.

The book probably explores the scientific and philosophical implications of sending a message to potential extraterrestrial civilizations.

It might also discuss the challenges and controversies surrounding the project, such as the selection of content and the potential risks of revealing Earth's location.

The book's impact is likely to be significant in the field of astrobiology and the search for extraterrestrial intelligence.