The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 8
... planets , we must alter the scale again , making the man sink far below visibility . With a reduction of a million ... planets or " asteroids " , few of which on this scale are much larger than grains of sand . We have to travel 483 ...
... planets , we must alter the scale again , making the man sink far below visibility . With a reduction of a million ... planets or " asteroids " , few of which on this scale are much larger than grains of sand . We have to travel 483 ...
Pagina 43
... planets , for now we must take into account the presence of the Sun. The reason is quite simple . It is the Sun's enormous gravi- tational field that holds all the planets , near and far , circling in their orbits as described in ...
... planets , for now we must take into account the presence of the Sun. The reason is quite simple . It is the Sun's enormous gravi- tational field that holds all the planets , near and far , circling in their orbits as described in ...
Pagina 119
... planets rather than their dimensions and distances apart - though it is worth looking at Figure 1 again to remind ourselves of these . For reasons which are still unknown , the planets appear to form two quite distinct classes . On the ...
... planets rather than their dimensions and distances apart - though it is worth looking at Figure 1 again to remind ourselves of these . For reasons which are still unknown , the planets appear to form two quite distinct classes . On the ...
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