The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 32
... body will never come back , but will creep over the top of the crater , as it were , and reach the horizontal level ( d ) . This velocity is 25,000 m.p.h. and is called " the velocity of escape ” . If a body started upwards with more ...
... body will never come back , but will creep over the top of the crater , as it were , and reach the horizontal level ( d ) . This velocity is 25,000 m.p.h. and is called " the velocity of escape ” . If a body started upwards with more ...
Pagina 33
... body need move to preserve its position . This is precisely how the Moon maintains itself in its orbit as it circles the Earth . And in just the same way the planets revolve round the Sun , prisoners of its gravitational field yet ...
... body need move to preserve its position . This is precisely how the Moon maintains itself in its orbit as it circles the Earth . And in just the same way the planets revolve round the Sun , prisoners of its gravitational field yet ...
Pagina 68
... body floating in space at the Earth's distance from the Sun. One side will be in shadow , the other in full sunlight . This side will become extremely hot — at least if it is darkened and so readily absorbs heat waves . In the extreme ...
... body floating in space at the Earth's distance from the Sun. One side will be in shadow , the other in full sunlight . This side will become extremely hot — at least if it is darkened and so readily absorbs heat waves . In the extreme ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
THE EARTH AND ITS NEIGHBOURS | 9 |
THE ROCKET | 17 |
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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