The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 15
... Earth we may wish it had a much smaller value . Of all natural forces , gravity is the most universal and it domi- nates any discussion of space - flight . Here on the Earth's surface we can never escape from its influence , and its ...
... Earth we may wish it had a much smaller value . Of all natural forces , gravity is the most universal and it domi- nates any discussion of space - flight . Here on the Earth's surface we can never escape from its influence , and its ...
Pagina 31
... Earth to a point so distant that gravity is negligible , one obtains a surprisingly simple result . The work involved is exactly the same as that needed to climb vertically through a distance equal to the radius of the Earth- say 4,000 ...
... Earth to a point so distant that gravity is negligible , one obtains a surprisingly simple result . The work involved is exactly the same as that needed to climb vertically through a distance equal to the radius of the Earth- say 4,000 ...
Pagina 61
... Earth , make a reconnaissance of the Moon , and return to the Earth orbit . ( 5 ) The type of ship designed for a lunar landing will be flown up from Earth or assembled in free orbit , and after refuelling will descend on the Moon . The ...
... Earth , make a reconnaissance of the Moon , and return to the Earth orbit . ( 5 ) The type of ship designed for a lunar landing will be flown up from Earth or assembled in free orbit , and after refuelling will descend on the Moon . The ...
Cuprins
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
Escaping from Earth | 30 |
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Termeni și expresii frecvente
acceleration already asteroids astronautics astronomers atmosphere body bricks British Astronomical Association 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 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 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