The Exploration of SpaceHarper, 1951 - 199 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 | 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