The Exploration of SpaceHarper, 1951 - 199 pagini |
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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 114
... completely from all sources of light , and wait a few minutes . Then they would become visible , first in tens and 1 I am indebted to Dr. W. H. Steavenson for pointing this out . then in thousands - but they would vanish again as 114 ...
... completely from all sources of light , and wait a few minutes . Then they would become visible , first in tens and 1 I am indebted to Dr. W. H. Steavenson for pointing this out . then in thousands - but they would vanish again as 114 ...
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
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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Termeni și expresii frecvente
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