The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 10
... million- fold , the Earth is now 40 feet in diameter , the Moon 10 feet across and a quarter of a mile away . The Sun is 93 miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus ...
... million- fold , the Earth is now 40 feet in diameter , the Moon 10 feet across and a quarter of a mile away . The Sun is 93 miles away and almost a mile across ; 36 and 67 miles from it , respectively , circle Mercury and Venus ...
Pagina 92
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the " interstellar gas " will be of no importance in travel between the planets , though as we shall see in ...
... million million millionth of that of air at sea level . For all practical purposes , this is a perfect vacuum : certainly the " interstellar gas " will be of no importance in travel between the planets , though as we shall see in ...
Pagina 163
... million - fold greater than terrestrial ones , interstellar distances are a million times greater still . Even light , which can pass from the Sun to Pluto in a few hours , takes over four years to reach the nearest of the stars . It is ...
... million - fold greater than terrestrial ones , interstellar distances are a million times greater still . Even light , which can pass from the Sun to Pluto in a few hours , takes over four years to reach the nearest of the stars . It is ...
Cuprins
THE SHAPING OF THE DREAM | 1 |
Automatic Rocket Surveying Mars | 4 |
THE EARTH AND ITS NEIGHBOURS | 9 |
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acceleration already astronautics astronomers atmosphere atomic rockets 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 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 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 trolley Uranus voyage weight