The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 41
... distance it was moving away from the earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the Earth's . Returning to our ...
... distance it was moving away from the earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the Earth's . Returning to our ...
Pagina 163
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
Pagina 164
... distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neighbours is visible , without a telescope , to us in the northern hemisphere ...
... distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neighbours is visible , without a telescope , to us in the northern hemisphere ...
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