The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 19
... impossible to think of any form of propulsion which does not . Even walking depends upon reaction : the friction of our shoes against the ground pushes the Earth backwards and so thrusts us forwards . It was Sir Isaac Newton who first ...
... impossible to think of any form of propulsion which does not . Even walking depends upon reaction : the friction of our shoes against the ground pushes the Earth backwards and so thrusts us forwards . It was Sir Isaac Newton who first ...
Pagina 35
... impossible . Before proceeding any further , however , it is a good idea to recall how many other things have been proved impossible in the past . One hundred and fifty years ago , distinguished mathematicians demonstrated that the new ...
... impossible . Before proceeding any further , however , it is a good idea to recall how many other things have been proved impossible in the past . One hundred and fifty years ago , distinguished mathematicians demonstrated that the new ...
Pagina 158
... impossible by any other means , and at very great economy . Shortly after the end of the Second World War , a good deal was heard in the Press about gigantic " space - mirrors " which the Germans were supposed to be considering as ...
... impossible by any other means , and at very great economy . Shortly after the end of the Second World War , a good deal was heard in the Press about gigantic " space - mirrors " which the Germans were supposed to be considering as ...
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