The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 44
... 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 thousand ...
... 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 thousand ...
Pagina 76
... relatively flat areas which would provide suitable places for a touch - down . Helicopter undercarriages have been made which are able to absorb rates of descent of forty feet a second , and this would correspond to a free fall on the ...
... relatively flat areas which would provide suitable places for a touch - down . Helicopter undercarriages have been made which are able to absorb rates of descent of forty feet a second , and this would correspond to a free fall on the ...
Pagina 170
... relatively close suns of our local system . We are looking past them , and across the immensity of intergalactic space , as a town - dweller might look past the street - lamps of his suburb to the lights of another city , many miles ...
... relatively close suns of our local system . We are looking past them , and across the immensity of intergalactic space , as a town - dweller might look past the street - lamps of his suburb to the lights of another city , many miles ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
THE EARTH AND ITS NEIGHBOURS | 9 |
THE ROCKET | 17 |
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Termeni și expresii frecvente
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