The Exploration of Space |
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Pagina 2
In A.D. 160 it seemed natural enough to imagine that , if one could make a workable pair of wings , they could be used to take one to the Moon . After Lucian , the theme of space - travel was neglected for almost fifteen hundred years .
In A.D. 160 it seemed natural enough to imagine that , if one could make a workable pair of wings , they could be used to take one to the Moon . After Lucian , the theme of space - travel was neglected for almost fifteen hundred years .
Pagina 20
Returning to our friend on the trolley , let us imagine that his vehicle is carrying a load of bricks ( Figure 5 ) . He takes one and throws it towards the right , producing a recoil as he does so . Since the mass of the brick is only a ...
Returning to our friend on the trolley , let us imagine that his vehicle is carrying a load of bricks ( Figure 5 ) . He takes one and throws it towards the right , producing a recoil as he does so . Since the mass of the brick is only a ...
Pagina 162
He imagines spherical planetoids many miles in diameter , with food - producing areas immediately beneath the transparent outer ... would be much roomier than we , with our flat , " two - dimensional ” outlook , can easily imagine .
He imagines spherical planetoids many miles in diameter , with food - producing areas immediately beneath the transparent outer ... would be much roomier than we , with our flat , " two - dimensional ” outlook , can easily imagine .
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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 moving 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 seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole