The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 33
... completely if its speed is over 25,000 m.p.h. If its speed is less than this , it may either fall back again or , if it is aimed in the correct direction , it may continue to orbit the Earth indefinitely in a circular or elliptical path ...
... completely if its speed is over 25,000 m.p.h. If its speed is less than this , it may either fall back again or , if it is aimed in the correct direction , it may continue to orbit the Earth indefinitely in a circular or elliptical path ...
Pagina 108
... completely airless , nor can we be sure that it is completely waterless . Water cannot exist in the liquid state under such low pressure , it is true , but hoar - frost might reasonably be expected to form in the night as a temporary ...
... completely airless , nor can we be sure that it is completely waterless . Water cannot exist in the liquid state under such low pressure , it is true , but hoar - frost might reasonably be expected to form in the night as a temporary ...
Pagina 179
... completely weightless . To take an even more extreme case , the very dense dwarf star Sirius B has a surface gravity at least 20,000 times as intense as the Earth's . Falling in such a field one would be accelerating more rapidly than a ...
... completely weightless . To take an even more extreme case , the very dense dwarf star Sirius B has a surface gravity at least 20,000 times as intense as the Earth's . Falling in such a field one would be accelerating more rapidly than a ...
Cuprins
FRONTISPIECE Automatic Rocket Surveying Mars PLATE I HighAltitude ManCarrying Rocket | 3 |
Spaceships Refuelling In Free Orbit | 4 |
The Earth and its Neighbours | 9 |
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Termeni și expresii frecvente
acceleration already asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical climb completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure flywheel free orbit fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles imagine important interplanetary flight interplanetary travel interstellar involved ionosphere journey Jupiter landing light light-years lunar 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 Propontis 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 trolley Uranus voyage weight