The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 15
... gravity . If gravity were weaker by a factor of four or five , the atmosphere would have escaped into space - as has happened in the case of the Moon . So we can be thankful for gravity in this respect , even though when we contemplate ...
... gravity . If gravity were weaker by a factor of four or five , the atmosphere would have escaped into space - as has happened in the case of the Moon . So we can be thankful for gravity in this respect , even though when we contemplate ...
Pagina 52
... gravity with dis- tance from the Earth . One could , and usually would , feel weight- less in a rocket a couple of hundred miles up , where the force of gravity is practically the same as here on the Earth's surface . The reason for ...
... gravity with dis- tance from the Earth . One could , and usually would , feel weight- less in a rocket a couple of hundred miles up , where the force of gravity is practically the same as here on the Earth's surface . The reason for ...
Pagina 97
... gravity . The only thing we can do is to look carefully at the functioning of the body , decide how gravity affects the various organs and physical processes , and then imagine what would happen if it were removed . The problem is ...
... gravity . The only thing we can do is to look carefully at the functioning of the body , decide how gravity affects the various organs and physical processes , and then imagine what would happen if it were removed . The problem is ...
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