The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 10
... moving in its orbit at 107,000 m.p.h. , the Earth at a more modest 68,000 and Pluto at a mere 10,000 m.p.h. The second important point is that almost all the planets lie in or very near the same plane , so that the Solar System is virtu ...
... moving in its orbit at 107,000 m.p.h. , the Earth at a more modest 68,000 and Pluto at a mere 10,000 m.p.h. The second important point is that almost all the planets lie in or very near the same plane , so that the Solar System is virtu ...
Pagina 52
... moving freely in empty space , with its motors cut off , is not resisting gravity : on the contrary , it is letting gravity take it where it will . It is sometimes said to be in free fall , but this is perhaps an unfortunate phrase ...
... moving freely in empty space , with its motors cut off , is not resisting gravity : on the contrary , it is letting gravity take it where it will . It is sometimes said to be in free fall , but this is perhaps an unfortunate phrase ...
Pagina 100
... moving past the portholes . Even then the impression would be a purely psychological one - of the kind most people have experienced when sitting in a train and seeing another apparently moving on a parallel track . In those ...
... moving past the portholes . Even then the impression would be a purely psychological one - of the kind most people have experienced when sitting in a train and seeing another apparently moving on a parallel track . In those ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
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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