Word: marse
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Dates: during 1960-1969
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The ion engine tested in a 30-minute, 3,200-mile flight over the Pacific got its thrust by passing vaporized cesium metal through a hot tungsten filter. This action strips electrons from the cesium, speeds the positively charged ions out the rear of the engine. The great advantage of...
A U.S. crew last won the fours in 1948, but Harvard's can't be counted out. They've been rowing together a year, less than most of the other crews, but their record is impressive--only a half-length loss in practice to Vesper's "middle four" mars their...
ROBINSON CRUSOE ON MARS. Based on valid speculation, this science-fiction saga imagines what might happen to a U.S. astronaut marooned on the red planet.
This does not mean that they do not exist. There is good evidence, says Brown, that when such visible stars condensed out of primitive gas and dust, many smaller bodies were also formed at the same time. Seven invisible objects somewhat bigger than Jupiter have already been detected by the...
This adds up to a vast number of "life-zone" planets-at least 200 billion in the Milky Way galaxy alone-and if planets smaller than Mars are included, the number is greater still. "If planetary systems are indeed extremely abundant," says Dr. Brown, "one might conclude with equal conviction...