The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 152
... whole Earth would be provided by three stations , revolving in the same orbit but spaced 120 de- grees apart ( Figure 18 ) . Since close satellites move across the sky with inconvenient speed these relay stations should be at a ...
... whole Earth would be provided by three stations , revolving in the same orbit but spaced 120 de- grees apart ( Figure 18 ) . Since close satellites move across the sky with inconvenient speed these relay stations should be at a ...
Pagina 167
... whole of space , or even in our own corner of the Galaxy . The geological evidence indicates that the Earth was formed about 5,000,000,000 years ago , and the other planets were proba- bly born at the same time . Man has been on Earth ...
... whole of space , or even in our own corner of the Galaxy . The geological evidence indicates that the Earth was formed about 5,000,000,000 years ago , and the other planets were proba- bly born at the same time . Man has been on Earth ...
Pagina 189
... whole story of Mankind before the twentieth century seems like the prelude to some great drama , played on the narrow strip of stage before the curtain has risen and revealed the scenery . For countless generations of men , that tiny ...
... whole story of Mankind before the twentieth century seems like the prelude to some great drama , played on the narrow strip of stage before the curtain has risen and revealed the scenery . For countless generations of men , that tiny ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless