The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 41
... field , which may be regarded as a much smaller version of the Earth's . Returning to our analogy on page 31 , it is as though some distance away from the 4,000- miles - deep pit at the bottom of which we live there was another pit ...
... field , which may be regarded as a much smaller version of the Earth's . Returning to our analogy on page 31 , it is as though some distance away from the 4,000- miles - deep pit at the bottom of which we live there was another pit ...
Pagina 44
... field is relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much more energy is re- quired in the escape from a planet's own gravitational field - something which has to be done in the first ...
... field is relatively gentle , and so little energy is needed to move along it . In most cases , in fact , much more energy is re- quired in the escape from a planet's own gravitational field - something which has to be done in the first ...
Pagina 179
... 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 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing light light-years lunar Mare Imbrium Mars and Venus Martian means Mercury meteors million minutes missile Moon Moon's motors never observed oxygen payload perhaps planetary planets Pluto possible pounds pressure pressurised probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refuelling return to Earth rocket power satellite Saturn scientific ship Solar System space space-flight space-station space-suits space-travel spaceship speed spinning stars stations surface take-off telescope temperature terrestrial thousand thrust tion trolley Uranus voyage weight