The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 43
... period of “ free coasting " will follow automatically . In this sense , there is an analogy between a spaceship and an artillery shell . Once the shell has been launched in the right direc- tion , no more work need be done , even though ...
... period of “ free coasting " will follow automatically . In this sense , there is an analogy between a spaceship and an artillery shell . Once the shell has been launched in the right direc- tion , no more work need be done , even though ...
Pagina 174
... periods of acceleration . It would not , however , help us to circumvent the restrictions set by the Theory of Rela- tivity . As far as any fact can be experimentally ... period of elapsed time might be 174 The Exploration of Space.
... periods of acceleration . It would not , however , help us to circumvent the restrictions set by the Theory of Rela- tivity . As far as any fact can be experimentally ... period of elapsed time might be 174 The Exploration of Space.
Pagina 186
... period of Man's existence , and the stamp the length of time during which he has been slightly civilized . The period during which life will be possible on Earth corresponds to a further column of stamps certainly hundreds of yards ...
... period of Man's existence , and the stamp the length of time during which he has been slightly civilized . The period during which life will be possible on Earth corresponds to a further column of stamps certainly hundreds of yards ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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Termeni și expresii frecvente
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