The Exploration of SpaceTemple Press, 1951 - 198 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 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
THE SHAPING OF THE DREAM | 1 |
THE EARTH AND ITS NEIGHBOURS | 9 |
THE ROCKET | 17 |
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able acceleration actual already appear astronautics astronomers atmosphere atomic become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discovered discuss distance Earth effect energy escape exist exploration extremely fact fall field Figure fuel give given gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing least less light limit live look lunar Mars material matter means miles minutes Moon motors necessary never observed once orbit oxygen perhaps period planets Plate possible practical present pressure probably problem produce purely radio reach reason relatively remain rocket round satellite scientific seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole