The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 34
... orbit as it circles the Earth . And in just the same way the planets revolve round the Sun , prisoners of its gravitational field yet always maintaining their distance . The speed necessary to move in such an orbit near the bottom of ...
... orbit as it circles the Earth . And in just the same way the planets revolve round the Sun , prisoners of its gravitational field yet always maintaining their distance . The speed necessary to move in such an orbit near the bottom of ...
Pagina 76
... orbit , and not make an actual landing on the Earth , it would have to shed just under 7,000 mph of its velocity to reach the speed of 18,000 mph needed for a close orbit . It could do this by means of air - resistance braking — as ...
... orbit , and not make an actual landing on the Earth , it would have to shed just under 7,000 mph of its velocity to reach the speed of 18,000 mph needed for a close orbit . It could do this by means of air - resistance braking — as ...
Pagina 157
... orbit of a satellite , causing its plane of rotation to precess or tilt slowly up and down . The effect is very small and in most cases would not be of any practical importance . It would always be possible to readjust an orbit , if ...
... orbit of a satellite , causing its plane of rotation to precess or tilt slowly up and down . The effect is very small and in most cases would not be of any practical importance . It would always be possible to readjust an orbit , if ...
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