The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 35
... build up escape velocity as quickly as possible — and then to cut the rockets and " coast . " A commonplace but accurate analogy is given by the cyclist who builds up enough speed on the level to take him over a hill . To surmount our ...
... build up escape velocity as quickly as possible — and then to cut the rockets and " coast . " A commonplace but accurate analogy is given by the cyclist who builds up enough speed on the level to take him over a hill . To surmount our ...
Pagina 76
... build up speed ( at least , once it has passed the " neutral point " where the two gravity fields balance ) and if it were not checked would reach the Earth again at the velocity with which it began its journey— 24,900 mph . As the type ...
... build up speed ( at least , once it has passed the " neutral point " where the two gravity fields balance ) and if it were not checked would reach the Earth again at the velocity with which it began its journey— 24,900 mph . As the type ...
Pagina 149
... build in- struments of enormous size to get reasonable definition . The biggest radio - telescope yet built is over 200 feet in diameter ( compared with 200 inches for the largest optical telescope ) but even so its resolving power ...
... build in- struments of enormous size to get reasonable definition . The biggest radio - telescope yet built is over 200 feet in diameter ( compared with 200 inches for the largest optical telescope ) but even so its resolving power ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
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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