The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 109
... astronomers until quite recently would have returned an unequivocal " No " , point- ing out that the lack of air and the temperature extremes ruled out the possibility . Most astronomers would still maintain this position , but a ...
... astronomers until quite recently would have returned an unequivocal " No " , point- ing out that the lack of air and the temperature extremes ruled out the possibility . Most astronomers would still maintain this position , but a ...
Pagina 130
... astronomers today accept this interpretation , and most do not believe in the existence of the canals at all . Yet there can be little doubt that large numbers of curious linear markings do exist on the planet . Even if they do not ...
... astronomers today accept this interpretation , and most do not believe in the existence of the canals at all . Yet there can be little doubt that large numbers of curious linear markings do exist on the planet . Even if they do not ...
Pagina 134
... astronomers were unable to keep track of even the 1,500 or so already detected - the work involved in calculating their orbits was too great . With the modern de- velopment of electronic computers , this difficulty has been over- come ...
... astronomers were unable to keep track of even the 1,500 or so already detected - the work involved in calculating their orbits was too great . With the modern de- velopment of electronic computers , this difficulty has been over- come ...
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