The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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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 | 9 |
THE ROCKET | 17 |
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able acceleration actual already appear astronautics astronomers atmosphere atomic become body build carry certainly Chapter close completely consider considerable course deal developed difficult direction discovered discuss distance Earth effect energy escape exist exploration extremely fact fall field Figure fuel give given gravity greater heat human hundred idea imagine important impossible increase interesting interplanetary involved journey known landing least less light limit live look lunar Mars material matter means miles minutes Moon motors necessary never observed once orbit oxygen perhaps period planets Plate possible practical present pressure probably problem produce purely radio reach reason relatively remain rocket round satellite scientific seems seen ship shown simple Solar space spaceship speed stars stations structure surface telescope temperature thousand Universe velocity Venus weight whole