The Exploration of SpaceHarper, 1951 - 199 pagini |
Din interiorul cărții
Rezultatele 1 - 3 din 63
Pagina 22
... speed when all the bricks have been used up . It should be fairly obvious that this final speed depends on two factors only- ( 1 ) the speed with which the bricks are thrown out , and ( 2 ) the quantity of bricks thrown out . Common ...
... speed when all the bricks have been used up . It should be fairly obvious that this final speed depends on two factors only- ( 1 ) the speed with which the bricks are thrown out , and ( 2 ) the quantity of bricks thrown out . Common ...
Pagina 33
... speed to main- tain itself . It fell downwards , gaining speed as it did so , until it had picked up enough speed to climb upwards again and retrace its orbit . Its path is thus not a circle , but an ellipse . All these cases could be ...
... speed to main- tain itself . It fell downwards , gaining speed as it did so , until it had picked up enough speed to climb upwards again and retrace its orbit . Its path is thus not a circle , but an ellipse . All these cases could be ...
Pagina 41
... speed , until at a great distance it was moving away from the Earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the ...
... speed , until at a great distance it was moving away from the Earth at a speed of only a few hundred miles an hour . Now the Moon has , of course , its own gravitational field , which may be regarded as a much smaller version of the ...
Cuprins
The Shaping of the Dream | 1 |
The Earth and Its Neighbours | 7 |
The Rocket | 17 |
Drept de autor | |
16 alte secțiuni nu sunt arătate
Alte ediții - Afișează-le pe toate
Termeni și expresii frecvente
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