The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 48
... reach speeds of perhaps 15,000 m.p.h. and heights of 2,000 miles , but they would be unable to reach circular velocity and so would have to return to Earth . To get into an orbit we should need something like the two- step rocket ...
... reach speeds of perhaps 15,000 m.p.h. and heights of 2,000 miles , but they would be unable to reach circular velocity and so would have to return to Earth . To get into an orbit we should need something like the two- step rocket ...
Pagina 77
... reach orbital velocity . In the case of the Moon , this is 3,700 m.p.h. ( thus a V.2 rocket could quite easily become a lunar sub - satellite ! ) . The ship might then be refuelled either by a tanker from Earth which had been waiting ...
... reach orbital velocity . In the case of the Moon , this is 3,700 m.p.h. ( thus a V.2 rocket could quite easily become a lunar sub - satellite ! ) . The ship might then be refuelled either by a tanker from Earth which had been waiting ...
Pagina 95
... reach escape velocity . However , if the ship could build up all its speed in the horizontal direction , gravity would not produce any loss of speed whatsoever and one could reach escape velocity in as leisurely a fashion as one pleased ...
... reach escape velocity . However , if the ship could build up all its speed in the horizontal direction , gravity would not produce any loss of speed whatsoever and one could reach escape velocity in as leisurely a fashion as one pleased ...
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