The Exploration of SpaceHarper, 1959 - 200 pagini |
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Pagina 160
... stars is even greater . Stars 10,000 times as bright as the Sun are known — as well as stars 10,000 times fainter . With these variations of brilliance go variations of color . Our Sun , whose light we regard as normal , is actually a ...
... stars is even greater . Stars 10,000 times as bright as the Sun are known — as well as stars 10,000 times fainter . With these variations of brilliance go variations of color . Our Sun , whose light we regard as normal , is actually a ...
Pagina 161
... stars around the sky . The heart of our own Galaxy , where the stars are clustered to- gether more thickly than they are in the neighborhood of the Sun , lies towards the constellation Sagittarius . Plate XIV gives some idea of the ...
... stars around the sky . The heart of our own Galaxy , where the stars are clustered to- gether more thickly than they are in the neighborhood of the Sun , lies towards the constellation Sagittarius . Plate XIV gives some idea of the ...
Pagina 165
... stars ( " variables " ) whose bril- liance fluctuates over a more modest range . Some of these stars appear to be pulsating , and they go through their cycle of brightness with clockwork precision . Others show no regularity in their ...
... stars ( " variables " ) whose bril- liance fluctuates over a more modest range . Some of these stars appear to be pulsating , and they go through their cycle of brightness with clockwork precision . Others show no regularity in their ...
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