《外太空條約》(Outer Space Treaty)喺國際法嗰度提供咗世界各國應該點樣看待外太空嘅一套框架。佢定義咗乜嘢係「太空」同埋天體,並且講到明話世界嘅各國都有權自由噉探索太空,而冇任何一個國家有資格霸住太空嚟用。佢亦都唔俾人喺外大空嗰度用核武。呢個條約係喺1963年由聯合國大會通過,而跟手喺1967年由美國、英國、同蘇聯簽埋嘅。直至2008年,呢條條約一共有98國(包括中國)簽咗[47]。
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Borowitz, Sidney; Beiser, Arthur (1971),Essentials of physics: a text for students of science and engineering, Addison-Wesley series in physics (第2版), Addison-Wesley Publishing Company{{citation}}:Invalid|ref=harv (help) Note: this source gives a value of2.7 × 1025 molecules per cubic meter.
Cajori, Florian (1917),A history of physics in its elementary branches: including the evolution of physical laboratories, New York: The Macmillan Company{{citation}}:Invalid|ref=harv (help)
Davies, P. C. W. (1977),The physics of time asymmetry, University of California Press,ISBN0-520-03247-0{{citation}}:Invalid|ref=harv (help) Note: a light year is about 1013 km.
Eckert, Michael (2006),The dawn of fluid dynamics: a discipline between science and technology, Wiley-VCH,ISBN3-527-40513-5{{citation}}:Invalid|ref=harv (help)
Freedman, Roger A.; Kaufmann, William J. (2005),Universe (第seventh版), New York: W. H. Freeman and Company,ISBN0-7167-8694-X{{citation}}:Invalid|ref=harv (help)
Fichtner, Horst; Liu, W. William (2011), "Advances in Coordinated Sun-Earth System Science Through Interdisciplinary Initiatives and International Programs", 寫喺Sopron, Hungary, 出自 Miralles, M.P.; Almeida, J. Sánchez (編),The Sun, the Solar Wind, and the Heliosphere, IAGA Special Sopron Book Series,第4卷, Berlin: Springer, p. 341,Bibcode:2011sswh.book..341F,doi:10.1007/978-90-481-9787-3_24,ISBN978-90-481-9786-6{{citation}}:Invalid|ref=harv (help)
Frisch, Priscilla C.; Müller, Hans R.; Zank, Gary P.; Lopate, C. (May 6–9, 2002), "Galactic environment of the Sun and stars: interstellar and interplanetary material", 出自 Livio, Mario; Reid, I. Neill; Sparks, William B. (編),Astrophysics of life. Proceedings of the Space Telescope Science Institute Symposium, Space Telescope Science Institute symposium series,第16卷, Baltimore, MD, USA: Cambridge University Press, p. 21,Bibcode:2005asli.symp...21F,ISBN0-521-82490-7{{citation}}:Invalid|ref=harv (help)
Gatti, Hilary (2002),Giordano Bruno and Renaissance science, Cornell University Press,ISBN0-8014-8785-4{{citation}}:Invalid|ref=harv (help)
Genz, Henning (2001),Nothingness: the science of empty space, Da Capo Press,ISBN0-7382-0610-5{{citation}}:Invalid|ref=harv (help)
Maor, Eli (1991),To infinity and beyond: a cultural history of the infinite, Princeton paperbacks,ISBN0-691-02511-8{{citation}}:Invalid|ref=harv (help)
Mendillo, Michael (November 8–10, 2000), "The atmosphere of the moon", 出自 Barbieri, Cesare; Rampazzi, Francesca (編),Earth-Moon Relationships, Padova, Italy at the Accademia Galileiana Di Scienze Lettere Ed Arti: Springer, p. 275,ISBN0-7923-7089-9{{citation}}:Invalid|ref=harv (help)
Needham, Joseph; Ronan, Colin (1985),The Shorter Science and Civilisation in China, Shorter Science and Civilisation in China,第2卷, Cambridge University Press,ISBN0-521-31536-0{{citation}}:Invalid|ref=harv (help)
Olenick, Richard P.; Apostol, Tom M.; Goodstein, David L. (1986),Beyond the mechanical universe: from electricity to modern physics, Cambridge University Press,ISBN0-521-30430-X{{citation}}:Invalid|ref=harv (help)
Porter, Roy; Park, Katharine; Daston, Lorraine (2006), "The Cambridge History of Science: Early modern science",Early Modern Science, Cambridge University Press,第3卷, p. 27,ISBN0-521-57244-4{{citation}}:Invalid|ref=harv (help)
Sparke, Linda S.; Gallagher, John S. (2007),Galaxies in the Universe: An Introduction (第2版), Cambridge University Press,ISBN978-0-521-85593-8{{citation}}:Invalid|ref=harv (help)
Spitzer, Lyman, Jr. (1978),Physical Processes in the Interstellar Medium, Wiley Classics Library,ISBN0471293350{{citation}}:Invalid|ref=harv (help)
Stuart Wortley, Emmeline Charlotte E. (1841),The maiden of Moscow, a poem, How and Parsons, Canto X, section XIV, lines 14–15,All Earth in madness moved,—o'erthrown, / To outer space—driven—racked—undone!{{citation}}:Invalid|ref=harv (help)
Thagard, Paul (1992),Conceptual revolutions, Princeton University Press,ISBN0-691-02490-1{{citation}}:Invalid|ref=harv (help)
Tyson, Neil deGrasse; Goldsmith, Donald (2004),Origins: fourteen billion years of cosmic evolution, W. W. Norton & Company, pp. 114–115,ISBN0-393-05992-8{{citation}}:Invalid|ref=harv (help)