The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 9
... 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 10
... 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 and ...
... 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 and ...
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 | 9 |
THE ROCKET | 17 |
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Termeni și expresii frecvente
able acceleration actual already appear astronautics astronomers atmosphere atomic become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discovered discuss distance Earth effect energy escape exist exploration extremely fact fall field Figure fuel give given gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing least less light limit live look lunar Mars material matter means miles minutes Moon motors necessary never observed once orbit oxygen perhaps period planets Plate possible practical present pressure probably problem produce purely radio reach reason relatively remain rocket round satellite scientific seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole