The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 41
... distance it was moving away from the Earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the Earth's . Returning to our ...
... distance it was moving away from the Earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the Earth's . Returning to our ...
Pagina 163
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
... distance . Our Sun is a quite typical star , although it is a good deal brighter than the average . ( Only three of the twenty nearest stars exceed it in brilliance , and the vast majority are far fainter . ) It is one of a very large ...
Pagina 164
... distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neigh- bours is visible , without a telescope , to us in the northern ...
... distance light travels in a year , is a convenient one for measuring stellar distances . It equals 5,880,000,000,000 miles . ) Only one of our nearest eight neigh- bours is visible , without a telescope , to us in the northern ...
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