The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 7
... miles is an inconceivably great distance - yet there are also men who think nothing of travelling ten thousand miles in a few days . As speeds of transport have increased , so our sense of distance has altered . Australia can never be ...
... miles is an inconceivably great distance - yet there are also men who think nothing of travelling ten thousand miles in a few days . As speeds of transport have increased , so our sense of distance has altered . Australia can never be ...
Pagina 8
... miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus . Mercury is 15 feet across , Venus 38 - a little smaller than the Earth . Beyond the Earth's orbit is Mars , 20 feet in diameter ...
... miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus . Mercury is 15 feet across , Venus 38 - a little smaller than the Earth . Beyond the Earth's orbit is Mars , 20 feet in diameter ...
Pagina 41
... 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 analogy on page 31 , it is as though some distance away from the 4,000- miles ...
... 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 analogy on page 31 , it is as though some distance away from the 4,000- miles ...
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