The Exploration of SpaceHarper, 1951 - 199 pagini |
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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 130
... observed around the melting ice . We would not be able to see , from Earth , the reflected sunlight in lakes at such ... observation , by many observ- ers . The disc of the planet also shows a vast number of minute markings which can ...
... observed around the melting ice . We would not be able to see , from Earth , the reflected sunlight in lakes at such ... observation , by many observ- ers . The disc of the planet also shows a vast number of minute markings which can ...
Pagina 135
... observed of the four : much of the information gained about him probably applies to Saturn , Uranus and Neptune . We can see no permanent surface markings on these planets : what we observe is the top of an immensely deep and turbulent ...
... observed of the four : much of the information gained about him probably applies to Saturn , Uranus and Neptune . We can see no permanent surface markings on these planets : what we observe is the top of an immensely deep and turbulent ...
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