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achieved aircraft airship alpha particles American apparatus artificial satellites Astronautical atmosphere atomic bomb atomic nucleus automatic balloon began Bell Berlin built cable calculations carriage carried century coleopter cosmic Curie discovery distance earth electric energy experiments fact feet fire flying German height horsepower hour human hundred hydrogen hydrogen bomb idea invention inventor journey large number later locomotive machine man's Marconi means mechanical ment miles million moon motor neutrons nuclear nucleus operation orbit Otto Hahn particles passengers patent physicists physics pioneers possible problem Professor protons radar radiation radio radioactive radium railway rays reached robots rocket Rutherford Sanger scientific scientists ship signals skeptics soon space flight space travel speed speed of light Sputnik station steam engine successful technical Telefunken telegraph telephone television theory thousand tion tons transmitter uranium Vanguard rocket vehicle velocity Watt wave length wheel wires Wright brothers wrote