The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 66
... suggested that we might employ Nature's method of purifying the atmosphere - in other words , suitable green plants should be carried in the spaceship ! As is well known , plants absorb carbon dioxide ( in the presence of sunlight ) and ...
... suggested that we might employ Nature's method of purifying the atmosphere - in other words , suitable green plants should be carried in the spaceship ! As is well known , plants absorb carbon dioxide ( in the presence of sunlight ) and ...
Pagina 124
... suggests that they are composed of ice , and this explanation is now universally accepted . The Martian icecaps ... suggested that the planet's characteristic redness is due to the presence of metallic oxides , particularly iron ...
... suggests that they are composed of ice , and this explanation is now universally accepted . The Martian icecaps ... suggested that the planet's characteristic redness is due to the presence of metallic oxides , particularly iron ...
Pagina 135
... suggested , " gigantic snowballs " ) . It is equally possible that our measurements are incorrect , for it is extremely difficult to determine the size of such small and distant objects with any degree of precision . We know very little ...
... suggested , " gigantic snowballs " ) . It is equally possible that our measurements are incorrect , for it is extremely difficult to determine the size of such small and distant objects with any degree of precision . We know very little ...
Cuprins
The Shaping of the Dream | 1 |
Navigation and Communication in Space | 78 |
1 | 118 |
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acceleration airless asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical completely course crew diameter difficult distance Earth energy engineering enormous escape velocity exploration extremely fact Figure free orbit fuel Galaxy gases gravitational field gravity heat hundred hydrogen imagine important interplanetary flight interplanetary travel interstellar ionosphere journey Jupiter landing LEWIS CARROLL light light-years lunar Mars and Venus Martian means Mercury meteors miles million minutes missiles Moon Moon's motors never normal observed orbit oxygen payload perhaps planetary Plate Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri R. A. Smith radar radiation radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-stations space-suits space-travel spaceship speed spinning stars stations structure sunlight surface take-off tanks telescope temperature thousand thrust trolley Uranus vehicle voyage weight weightless