The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 81
... less than three , and would often be five , bright planets available for observation this is clearly a very useful method , as well as an extremely simple one . An alternative though less accurate method of position- finding would be to ...
... less than three , and would often be five , bright planets available for observation this is clearly a very useful method , as well as an extremely simple one . An alternative though less accurate method of position- finding would be to ...
Pagina 120
... less than that of water ) . We are forced to conclude from this that the four giant planets are partly gaseous or liquid , perhaps possessing solid cores only at great depths below an immensely thick atmosphere . Telescopic observations ...
... less than that of water ) . We are forced to conclude from this that the four giant planets are partly gaseous or liquid , perhaps possessing solid cores only at great depths below an immensely thick atmosphere . Telescopic observations ...
Pagina 180
... less to the travellers themselves . To imagine any long - range exploration of the Universe we have to assume voyages lasting many centuries , or even millions of years . Such voyages could be possible only if whole generations were ...
... less to the travellers themselves . To imagine any long - range exploration of the Universe we have to assume voyages lasting many centuries , or even millions of years . Such voyages could be possible only if whole generations were ...
Cuprins
Automatic Rocket Surveying Mars | 3 |
The Earth and its Neighbours | 9 |
The Rocket | 17 |
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acceleration already astronautics astronomers atmosphere body bricks British Astronomical Association 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 involved ionosphere journey Jupiter landing light light-years lunar 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 trolley Uranus voyage weight