The Exploration of SpaceHarper, 1951 - 199 pagini |
Din interiorul cărții
Rezultatele 1 - 3 din 23
Pagina 170
... universes , 2 and it is about 700,000 light - years away . In whatever direction we look ( except those in which ... universe ” is merely the Milky Way system . Astronomers usually employ the word " cosmos " to describe the whole of ...
... universes , 2 and it is about 700,000 light - years away . In whatever direction we look ( except those in which ... universe ” is merely the Milky Way system . Astronomers usually employ the word " cosmos " to describe the whole of ...
Pagina 181
... Universe , why have they never come to Earth ? One answer to this is given by Plate XIV ( b ) . The tightly packed star - fields shown there cover only a small portion of the Milky Way , and each of those stars is separated from its ...
... Universe , why have they never come to Earth ? One answer to this is given by Plate XIV ( b ) . The tightly packed star - fields shown there cover only a small portion of the Milky Way , and each of those stars is separated from its ...
Pagina 194
... Universe until we have explored the whole Cosmos- and that prospect is still , to say the least , satisfyingly remote , if indeed it is theoretically possible . We have scarcely begun a voyage of discovery which may never have an end ...
... Universe until we have explored the whole Cosmos- and that prospect is still , to say the least , satisfyingly remote , if indeed it is theoretically possible . We have scarcely begun a voyage of discovery which may never have an end ...
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