The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 105
... observed , with the very smallest of telescopes , if one watches the Moon wax from new to full . The line of sunrise then marches steadily across the disc , and one can watch the mountains climb out of the night as their peaks catch the ...
... observed , with the very smallest of telescopes , if one watches the Moon wax from new to full . The line of sunrise then marches steadily across the disc , and one can watch the mountains climb out of the night as their peaks catch the ...
Pagina 128
... observed : it is about twice as abundant on Mars as on Earth . Water vapour has not been detected in the atmosphere , but infra - red bands due to ice have been observed in the polar caps . The air pressure at the surface of Mars is ...
... observed : it is about twice as abundant on Mars as on Earth . Water vapour has not been detected in the atmosphere , but infra - red bands due to ice have been observed in the polar caps . The air pressure at the surface of Mars is ...
Pagina 154
... observe the primary radiations . Our knowledge of the ionosphere , which is of great practical impor- tance in radio ... observed visually from the Earth . For centuries navigators have found their way over the surface of this planet by ...
... observe the primary radiations . Our knowledge of the ionosphere , which is of great practical impor- tance in radio ... observed visually from the Earth . For centuries navigators have found their way over the surface of this planet by ...
Cuprins
Automatic Rocket Surveying Mars | 3 |
The Earth and its Neighbours | 9 |
The Rocket | 17 |
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acceleration already 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 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 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