The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 12
... given by the aurora , whose ghostly beams and curtains of light we seldom see in southern latitudes , but which are common enough near the magnetic poles . The aurora is produced by electrical discharges very similar to those in neon ...
... given by the aurora , whose ghostly beams and curtains of light we seldom see in southern latitudes , but which are common enough near the magnetic poles . The aurora is produced by electrical discharges very similar to those in neon ...
Pagina 41
... given by the fact that though an initial speed of 25,000 m.p.h. is needed for a rocket to reach the Moon ( closest distance 240,000 miles ) a rocket launched in the correct direction at 26,000 m.p.h. would reach Venus ( closest distance ...
... given by the fact that though an initial speed of 25,000 m.p.h. is needed for a rocket to reach the Moon ( closest distance 240,000 miles ) a rocket launched in the correct direction at 26,000 m.p.h. would reach Venus ( closest distance ...
Pagina 115
... Given a sufficient source of power it can , there- fore , in principle be extracted . Water is also a common constituent of many minerals , and can be removed simply by heating . On the Moon it would be possible to obtain plenty of heat ...
... Given a sufficient source of power it can , there- fore , in principle be extracted . Water is also a common constituent of many minerals , and can be removed simply by heating . On the Moon it would be possible to obtain plenty of heat ...
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