Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
"The earth belongs to the people"
(DLC/PP-1936:0089). Forms part of: Cabinet of American illustration (Library of Congress). Published in: A Connecticut Yankee in King Arthur's court / Samuel Clemens. New York : Charles L. Webster & Co., 1889, ... More
Where will it strike next? / K.
Illustration shows a comet labeled "Allds Investigation" striking a planet labeled "Albany Legislature" causing it to explode among planets labeled "Aldrich, Penrose, Payne, Vreeland, Dalzell, Cannon, Hitchcock... More
Underneath the tango moon - gramophone disc, record label
Male vocal duet, with orchestra Public domain photograph of gramophone disc label - sticker, record label, music record, free to use, no copyright restrictions image - Picryl description
The drama of the heavens--Adler Planetarium, operated by Chicago Park ...
Poster shows stars, planets, and constellations over a planetarium building. Work Projects Administration Poster Collection (Library of Congress). Posters of the WPA / Christopher DeNoon. Los Angeles: Wheatly P... More
A visitor in the morning sky: an impression of Halley's Comet in the e...
Reproduction of drawing by Elizabeth Shippen Green Elliott. Illus. in: Harper's weekly, v. 54, 1910 May 21, p. 3. Freitag, no. 854. Published in: Halley's Comet: a bibliography / compiled by Ruth S. Freitag. Wa... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More
Direct contact among galactic civilizations by relativistic interstell...
A draft of Sagan's paper, "Direct contact among galactic civilizations by relativistic interstellar spaceflight." The paper explores models for the distribution of technical civilizations in the galaxy. Using F... More