The Exploration of SpaceTemple Press, 1951 - 198 pagini |
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Pagina 48
... reach speeds of perhaps 15,000 m.p.h. and heights of 2,000 miles , but they would be unable to reach circular velocity and so would have to return to Earth . To get into an orbit we should need something like the two- step rocket ...
... reach speeds of perhaps 15,000 m.p.h. and heights of 2,000 miles , but they would be unable to reach circular velocity and so would have to return to Earth . To get into an orbit we should need something like the two- step rocket ...
Pagina 77
... reach orbital velocity . In the case of the Moon , this is 3,700 m.p.h. ( thus a V.2 rocket could quite easily become a lunar sub - satellite ! ) . The ship might then be refuelled either by a tanker from Earth which had been waiting ...
... reach orbital velocity . In the case of the Moon , this is 3,700 m.p.h. ( thus a V.2 rocket could quite easily become a lunar sub - satellite ! ) . The ship might then be refuelled either by a tanker from Earth which had been waiting ...
Pagina 193
... reach that outer reality , but one day we may hope to reach other prisoners in adjoining caves , where we may learn far more than we could ever do by our own unaided efforts . Yet space - travel will not , as some fear , destroy the ...
... reach that outer reality , but one day we may hope to reach other prisoners in adjoining caves , where we may learn far more than we could ever do by our own unaided efforts . Yet space - travel will not , as some fear , destroy the ...
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