The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 52
... perhaps an unfortunate phrase because the word " fall ” usually implies " downwards " . The spaceship , as we have seen , could be moving upwards or horizontally while under the influ- ence of gravity alone . So perhaps a better phrase ...
... perhaps an unfortunate phrase because the word " fall ” usually implies " downwards " . The spaceship , as we have seen , could be moving upwards or horizontally while under the influ- ence of gravity alone . So perhaps a better phrase ...
Pagina 128
... perhaps a fifteenth of its sea - level value here . We would have to ascend higher than the summit of Mount Everest to encounter so low a pressure on Earth , and even if the Martian atmosphere consisted entirely of pure oxygen we could ...
... perhaps a fifteenth of its sea - level value here . We would have to ascend higher than the summit of Mount Everest to encounter so low a pressure on Earth , and even if the Martian atmosphere consisted entirely of pure oxygen we could ...
Pagina 191
... perhaps the most exciting of all the possibilities revealed by astronautics . Whether or not Man is alone in the Universe is one of the supreme questions of philosophy . It is difficult to imagine that anyone could fail to be interested ...
... perhaps the most exciting of all the possibilities revealed by astronautics . Whether or not Man is alone in the Universe is one of the supreme questions of philosophy . It is difficult to imagine that anyone could fail to be interested ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks 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 ionosphere journey Jupiter landing light light-years lunar Mare Imbrium 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 tion trolley Uranus voyage weight