In this document, Carl Sagan describes the lumens (a unit of measure for visible light) given off by various cities in California. From Carl Sagan's "ideas riding" files, a play on "ideas writing." These files More
In this document, Carl Sagan considers the properties of the clouds of Venus. He notes that the clouds "are not water, because the temperature of the clouds of Venus is so large that much of the water vapor wou More
In this document, Carl Sagan suggests "an astronomical observatory on Mars would permit observations of astronomical parallaxes to be improved by about fifty percent." From Carl Sagan's "ideas riding" files, a More
In this document, Carl Sagan imagines the history of the galaxy with respect to extraterrestrial intelligence. He mentions the first generation of stars, the formation of planets, the evolution of stars, the de More
In this document, Carl Sagan ponders if interstellar communication might not be "messages but music." He notes that "there are phenomena from the atomic to the stellar and galactic where harmonies and resonance More
In this document, Carl Sagan asks "why are clouds white?" He notes "It is certainly not an exact compensation by absorption for the solar spectrum, because the compensation would have to be too precise." From C More
In this document, Carl Sagan notes similarities between whale song and cello music. He suggests it "would be a good idea to position Mstislav Rostropovich on poop-deck of a fast Caribbean boat and have him harm More
In this document, Carl Sagan records a "very speculative idea." He suggests extremely large organisms on Jupiter could use radio waves for inter-organism communication. From Carl Sagan's "ideas riding" files, a More
In this document, Carl Sagan suggests two different potential names for the television series he was working on, then tentatively called "Man and the cosmos." He considers renaming it "There" [with some subtitl More
In this document, Carl Sagan briefly describes an idea to show "alternate universes" with "Mayan high technology" in the television series Cosmos: A personal voyage. This includes "a space vehicle named and dec More
In this document, Carl Sagan suggests scientists should tithe ten percent of their time to public science education to safeguard future funding and support for science. From Carl Sagan's "ideas riding" files, a More
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In this document, Carl Sagan outlines a plot for a science fiction novel. The outline involves the CIA and the NSA investigating UFOs. The tentative conclusion of this novel is "There is, probably on a small sc More
In this document, Carl Sagan considers how superstition and pseudoscience persist in the face of science. He suggests "There is no aspect of nature which fails to reveal a deep mystery, to touch our sense of aw More