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the day after we land on mars
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advances artificial satellites astronauts astronomers atomic back to earth basic research billion bomb clouds communication satellites cosmic rays cost course Cyrano decade dollars dust earth's atmosphere electromagnetic spectrum engineering environment equipment experiments future human hundred instruments International Geophysical investment ionosphere knowledge land launching layer live lunar lunar surface man's Mars Martian measure ments meteorological military missile moon moon's NASA object observations observatory oceans orbit outer space oxygen payload perhaps physical planetary planets possible pounds predict present prestige problems radiation relay reprinted by permission rocket Russians schools scientific scientists solar Soviet space effort space exploration space flight space program space research space travel space vehicles space voyage specific impulse speed Sputnik stars stations telerobots telescope television temperature things thousand miles tion trip ultraviolet United universe velocity Venus weather