The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 164
... 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 colour . 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 colour . Our Sun , whose light we regard as normal , is actually a ...
Pagina 168
... stars , so closely packed towards the centre that the separate suns must be only light - hours apart , as against the light - years that normally lie between stars . There could be no such things as night and darkness on any worlds at ...
... stars , so closely packed towards the centre that the separate suns must be only light - hours apart , as against the light - years that normally lie between stars . There could be no such things as night and darkness on any worlds at ...
Pagina 174
... stars ( ignoring , for the moment , the fact that the stars themselves are in motion at speeds of several miles a second ) . The journey to Proxima Centauri would last a trifle more than 70,000 years . Thus al- though a very far ...
... stars ( ignoring , for the moment , the fact that the stars themselves are in motion at speeds of several miles a second ) . The journey to Proxima Centauri would last a trifle more than 70,000 years . Thus al- though a very far ...
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