The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 20
... involved are very far from being equal . Yet once again the same law of reaction holds . If the gun weighed a thousand times as much as the bullet , it would recoil at a thousandth of the bullet's speed . Now , perhaps , we can consider ...
... involved are very far from being equal . Yet once again the same law of reaction holds . If the gun weighed a thousand times as much as the bullet , it would recoil at a thousandth of the bullet's speed . Now , perhaps , we can consider ...
Pagina 85
... involved they would , if they were ignored , cause a spaceship to be " above " or " below " the planets , at the end of its voyage , by as much as 5,000,000 miles . To correct for this it would be advisable to make a small change of ...
... involved they would , if they were ignored , cause a spaceship to be " above " or " below " the planets , at the end of its voyage , by as much as 5,000,000 miles . To correct for this it would be advisable to make a small change of ...
Pagina 152
... involved in building the 200 - inch telescope on Mount Palomar were not primarily optical ones : they were largely due to the fact that the mirror and its auxiliaries had to remain rigid to a few millionths of an inch , no matter how ...
... involved in building the 200 - inch telescope on Mount Palomar were not primarily optical ones : they were largely due to the fact that the mirror and its auxiliaries had to remain rigid to a few millionths of an inch , no matter how ...
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