The Exploration of SpaceHarper, 1951 - 199 pagini |
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Pagina 1
... astronomers had calculated the distances of the planets before , but now at last Man had an instrument with which he ... astronomer of the time - indeed , one of the greatest of all time . Johannes Kepler was the first man to ...
... astronomers had calculated the distances of the planets before , but now at last Man had an instrument with which he ... astronomer of the time - indeed , one of the greatest of all time . Johannes Kepler was the first man to ...
Pagina 130
... astronomers today accept this interpretation , and most do not believe in the existence of the canals at all . Yet there can be little doubt that large numbers of curious linear markings do exist on the planet . Even if they do not ...
... astronomers today accept this interpretation , and most do not believe in the existence of the canals at all . Yet there can be little doubt that large numbers of curious linear markings do exist on the planet . Even if they do not ...
Pagina 134
... astronomers were unable to keep track of even the 1,500 or so already detected - the work involved in calculating their orbits was too great . With the modern de- velopment of electronic computers , this difficulty has been over- come ...
... astronomers were unable to keep track of even the 1,500 or so already detected - the work involved in calculating their orbits was too great . With the modern de- velopment of electronic computers , this difficulty has been over- come ...
Cuprins
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
Escaping from Earth | 30 |
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Termeni și expresii frecvente
acceleration already asteroids astronautics astronomers atmosphere body bricks British Astronomical Association 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 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 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