The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 8
... million- fold , the Earth is now 40 feet in diameter , the Moon 10 feet across and a quarter of a mile away . The Sun is 93 miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus ...
... million- fold , the Earth is now 40 feet in diameter , the Moon 10 feet across and a quarter of a mile away . The Sun is 93 miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus ...
Pagina 92
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the “ inter- stellar gas " will be of no importance in travel between the planets , though as we shall see in ...
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the “ inter- stellar gas " will be of no importance in travel between the planets , though as we shall see in ...
Pagina 185
... million or ten thousand million is not , fundamentally , what is important . There are already far too many people on this planet , by whatever standards one judges the matter . It would be no cause for boasting if , after some ...
... million or ten thousand million is not , fundamentally , what is important . There are already far too many people on this planet , by whatever standards one judges the matter . It would be no cause for boasting if , after some ...
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