The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 45
... shown in Figure 10 are , however , by no means the only paths that would take us from Earth to Mars and Venus : they are merely the most economical ones . Faster and more direct routes are conceivable , but they would require very much ...
... shown in Figure 10 are , however , by no means the only paths that would take us from Earth to Mars and Venus : they are merely the most economical ones . Faster and more direct routes are conceivable , but they would require very much ...
Pagina 83
... shown at ( a ) . Now let us suppose that calculation has shown that the velocity should be along the line AC . Elementary dynamics tells us that to give the ship this required velocity , we must impart to it a speed in the direction BC ...
... shown at ( a ) . Now let us suppose that calculation has shown that the velocity should be along the line AC . Elementary dynamics tells us that to give the ship this required velocity , we must impart to it a speed in the direction BC ...
Pagina 105
... shown in this drawing : indeed , when the Moon is full , its mountains cannot be seen at all , for no shadows are visible to produce an impression of relief or solidity , and the disc appears flat and most uninteresting . But everything ...
... shown in this drawing : indeed , when the Moon is full , its mountains cannot be seen at all , for no shadows are visible to produce an impression of relief or solidity , and the disc appears flat and most uninteresting . But everything ...
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