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Direct contact among galactic civilizations by relativistic interstellar spaceflight : draft
Direct contact among galactic civilizations by relativistic interstellar spaceflight : draft
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Tags

space travel
interplanetary voyages
extraterrestrial life
life on other planets
habitable planets
drake frank d
drake equation
relativity physics
carl sagan
manuscripts
direct
contact
direct contact
civilizations
spaceflight
draft
date_range

Date

01/01/1960
person

Contributors

Sagan, Carl (Author)
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Source

Library of Congress
link

Link

http://www.loc.gov/
copyright

Rights advisory

Public Domain

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