The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 31
... field , if " g " remained constant at its sea - level value . 4.000 MILES EARTH ( d ) ( h ) ( 8 ) MILES 1,500 ( c ) ( e ) 1,000 500 Figure 9. The " Pit " Analogy of the Earth's Gravitational Field We dwellers on the Earth's surface ...
... field , if " g " remained constant at its sea - level value . 4.000 MILES EARTH ( d ) ( h ) ( 8 ) MILES 1,500 ( c ) ( e ) 1,000 500 Figure 9. The " Pit " Analogy of the Earth's Gravitational Field We dwellers on the Earth's surface ...
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 what- soever . 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 what- soever . If we can ever generate the equivalent of a controlled gravita- tional field we shall ...
Cuprins
FRONTISPIECE Automatic Rocket Surveying Mars PLATE I HighAltitude ManCarrying Rocket | 3 |
Spaceships Refuelling In Free Orbit | 4 |
The Earth and its Neighbours | 9 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical climb completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure flywheel free orbit fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles imagine important interplanetary flight interplanetary travel interstellar involved ionosphere journey Jupiter landing light light-years lunar 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 Propontis 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 trolley Uranus voyage weight