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
FRONTISPIECE Automatic Rocket Surveying Mars PLATE I HighAltitude ManCarrying Rocket | 3 |
Spaceships Refuelling In Free Orbit | 4 |
The Earth and its Neighbours | 9 |
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acceleration already asteroids astronautics astronomers atmosphere body bricks build carry certainly Chapter chemical climb completely course crew degrees F difficult direction distance Earth energy enormous escape velocity exploration extremely fact Figure flywheel free orbit fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles imagine important interplanetary flight interplanetary travel interstellar involved 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 Propontis 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