Word: earthborn
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...what discoveries he can make with it. Its electron beams have already penetrated inch-thick aluminum, made copper radioactive. Its medical applications, like those of the cyclotron which once struck the bewildered public as a useless device, must be explored. In time the betatron may be able to produce earthborn artificial cosmic rays, whose fantastic energies - hundreds of millions of volts - now smite the earth mysteriously from among the stars...
...object of Herr Oberth's researches. The Society considered that he had actually made progress toward ''practical interstellar navigation." The problem begins, and so far has ended, with the forces by which Earth clutches that which is its own. To escape the pull of gravity, an earthborn body would have to take off at terrific speed. Outside the earthly atmosphere, interstellar gases are so rare that they would afford no traction for an airplane's propellor, no buoyance for wings. Most scientists with lunar leanings have therefore pondered shooting themselves moonwards in rockets. Herr Oberth, bearing...