The Exploration of SpacePocket Books, 1979 - 237 pagini Presents a nonscientific explanation of space exploration and a view of future life on other planets. |
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Pagina 39
... DISTANCE FROM CENTRE OF EARTH Figure 3. The Reduction of Gravity with Distance This picture of gravity as producing a hill , up which we have to climb to get away from the Earth , is a very useful one , and we will employ it again later ...
... DISTANCE FROM CENTRE OF EARTH Figure 3. The Reduction of Gravity with Distance This picture of gravity as producing a hill , up which we have to climb to get away from the Earth , is a very useful one , and we will employ it again later ...
Pagina 67
... distance 240,000 miles ) a rocket launched in the correct direction at 26,000 m.p.h. would reach Venus ( closest distance 26,000,000 miles ) ! Practically the same speed would enable Mars to be reached ( closest distance 35,000,000 ...
... distance 240,000 miles ) a rocket launched in the correct direction at 26,000 m.p.h. would reach Venus ( closest distance 26,000,000 miles ) ! Practically the same speed would enable Mars to be reached ( closest distance 35,000,000 ...
Pagina 115
... distances concerned . We have several times mentioned the use of radio and radar in space , and this is a subject of almost as much importance as the building of rocket motors themselves . It is true that ... distance services possible 115.
... distances concerned . We have several times mentioned the use of radio and radar in space , and this is a subject of almost as much importance as the building of rocket motors themselves . It is true that ... distance services possible 115.
Cuprins
Preface to the 1951 Edition | 11 |
Thirty Years Later | 15 |
The Shaping of the Dream | 21 |
Drept de autor | |
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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