The Exploration of SpacePresents a nonscientific explanation of space exploration and a view of future life on other planets. |
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Pagina 57
When one calculates the amount of work that has to be done in lifting a body from the surface of the Earth to a point so distant that gravity is negligible , one obtains a surprisingly simple result . The work involved is exactly the ...
When one calculates the amount of work that has to be done in lifting a body from the surface of the Earth to a point so distant that gravity is negligible , one obtains a surprisingly simple result . The work involved is exactly the ...
Pagina 138
From such observations it has been possible to discover facts about the nature of the Moon's surface and the temperature below the crust . Under perfect seeing conditions , an object only a few hundred feet across could be observed on ...
From such observations it has been possible to discover facts about the nature of the Moon's surface and the temperature below the crust . Under perfect seeing conditions , an object only a few hundred feet across could be observed on ...
Pagina 187
At greater heights , the orbital speed needed is less and so the period of revolution increases ; 22,000 miles above the surface the period is exactly twenty - four hours , and a body here , if originally above the Equator , would ...
At greater heights , the orbital speed needed is less and so the period of revolution increases ; 22,000 miles above the surface the period is exactly twenty - four hours , and a body here , if originally above the Equator , would ...
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Cuprins
Preface to the 1951 Edition | 11 |
Thirty Years Later | 15 |
The Shaping of the Dream | 21 |
Drept de autor | |
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Termeni și expresii frecvente
able acceleration achieved actual already appear astronautics atmosphere become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discuss distance Earth effect energy equal escape exist exploration extremely fact fall field Figure fuel give gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing later least less light limit live look lunar Mars material matter means miles million minutes Moon moving necessary never normal observed once orbit oxygen perhaps period planets possible practical present pressure probably problem produce purely radio range reach reason remain rocket round satellite scientific seems seen ship simple Solar space spaceship speed stars surface telescope temperature thousand tion velocity Venus weight
Referințe la această carte
The MIR Space Station: A Precursor to Space Colonization David M. Harland Vizualizare fragmente - 1997 |
Space Travel: A History Wernher Von Braun,Frederick Ira Ordway (III),Fred Durant,David Dooling Vizualizare fragmente - 1985 |