The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 39
... Fields of Earth and Moon arrive so quickly . However , once a vehicle has escaped from the gravitational field of the Earth it has achieved the freedom of space and can reach the nearer planets almost as easily as the Moon . ( That is ...
... Fields of Earth and Moon arrive so quickly . However , once a vehicle has escaped from the gravitational field of the Earth it has achieved the freedom of space and can reach the nearer planets almost as easily as the Moon . ( That is ...
Pagina 43
... field . It is extremely fortunate for astronautics that , at the distances of the planets from the Sun , the " slope " of this field is relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much ...
... field . It is extremely fortunate for astronautics that , at the distances of the planets from the Sun , the " slope " of this field is relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much ...
Pagina 174
... field , one would be accelerating more rapidly than a shell while it was being fired from a gun , but there would be no feeling of strain whatsoever . If we can ever generate the equivalent of a controlled gravita- tional field we shall ...
... field , one would be accelerating more rapidly than a shell while it was being fired from a gun , but there would be no feeling of strain whatsoever . If we can ever generate the equivalent of a controlled gravita- tional field we shall ...
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