The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 70
... minutes , it is completely changing its direction of motion every three - quarters of an hour . If it is traveling westwards at its orbital speed of 18,000 mph at one moment , it is moving eastwards at the same speed forty - five minutes ...
... minutes , it is completely changing its direction of motion every three - quarters of an hour . If it is traveling westwards at its orbital speed of 18,000 mph at one moment , it is moving eastwards at the same speed forty - five minutes ...
Pagina 71
... minutes it would have built up speed from 18,000 mph to the 24,900 mph needed to get it to the Moon . During the closing stages the motors would probably be throttled back to give a lower acceleration , in order to make it easier to ...
... minutes it would have built up speed from 18,000 mph to the 24,900 mph needed to get it to the Moon . During the closing stages the motors would probably be throttled back to give a lower acceleration , in order to make it easier to ...
Pagina 74
... minutes , during which time the ship would cover a distance of 160 miles . It would certainly seem dangerous - not to mention hard on the nerves of the crew ! -to wait until the Moon was so close before doing any braking . Yet it would ...
... minutes , during which time the ship would cover a distance of 160 miles . It would certainly seem dangerous - not to mention hard on the nerves of the crew ! -to wait until the Moon was so close before doing any braking . Yet it would ...
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