The Exploration of SpacePocket Books, 1979 - 237 pagini Presents a nonscientific explanation of space exploration and a view of future life on other planets. |
Din interiorul cărții
Rezultatele 1 - 3 din 52
Pagina 33
... miles away and almost a mile across ; thirty - six and sixty - seven miles from it , respectively , circle Mercury and Venus . Mer- cury is fifteen feet across , Venus thirty - eight — a little smaller than the Earth . Beyond the ...
... miles away and almost a mile across ; thirty - six and sixty - seven miles from it , respectively , circle Mercury and Venus . Mer- cury is fifteen feet across , Venus thirty - eight — a little smaller than the Earth . Beyond the ...
Pagina 38
... miles ) it still has ninety percent of its value at sea level . As the distance from the Earth lengthens into the thousands of miles , the reduction becomes substantial : twelve thousand miles up , a one - pound weight would weigh only ...
... miles ) it still has ninety percent of its value at sea level . As the distance from the Earth lengthens into the thousands of miles , the reduction becomes substantial : twelve thousand miles up , a one - pound weight would weigh only ...
Pagina 67
... miles - deep pit at the bottom of which we live there was another pit , this time only 170 miles deep . Dropping into this pit as it approached the Moon ( or in more conventional terms , falling in the Moon's gravi- tational field ) the ...
... miles - deep pit at the bottom of which we live there was another pit , this time only 170 miles deep . Dropping into this pit as it approached the Moon ( or in more conventional terms , falling in the Moon's gravi- tational field ) the ...
Cuprins
Preface to the 1951 Edition | 11 |
Thirty Years Later | 15 |
The Shaping of the Dream | 21 |
Drept de autor | |
18 alte secțiuni nu sunt arătate
Alte ediții - Afișează-le pe toate
Termeni și expresii frecvente
acceleration airless already astronautics astronomers atmo atmosphere body bricks build carry certainly Chapter chemical completely conquest of space consider course crew degrees F difficult direction distance Earth energy enormous escape velocity exist exploration extremely fact Figure fuel Galaxy giant gravitational field gravity heat Hermann Oberth hundred miles idea imagine important interplanetary flight interplanetary travel interstellar ionosphere Jerry Pournelle journey Jupiter landing large number light light-years lunar Mars and Venus Martian means Mercury meteors miles in diameter million minutes missile Moon Moon's motors never normal observed once oxygen payload perhaps planetary planets Pluto possible pounds pressure probably problem produce propellant propulsion Proxima Centauri radar radio reach reason refueling rocket power satellite Saturn scientific ship Solar System space space-flight space-station space-suits space-travel spaceship speed spin stars stations surface take-off telescope temperature thousand thrust tion trolley voyage weight weightless