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In 1912 Victor Franz Hess made the revolutionary discovery that ionizing radiation is incident upon the Earth from outer space. He showed with ground-based and balloon-borne detectors that the intensity of the radiation did not change significantly between day and night. Consequently, the sun could not be regarded as the sources of this radiation and the question of its origin remained unanswered. Today, almost one hundred years later the question of the origin of the cosmic radiation still remains a mystery.Hess' discovery has given an enormous impetus to large areas of science, in pa

Cosmic rays --- Rayonnement cosmique --- ELSEVIER-B EPUB-LIV-FT --- Cosmic rays. --- Radioactivity. --- Nuclear reactions --- Radiation --- Millikan rays --- Extraterrestrial radiation --- Ionizing radiation --- Nuclear physics --- Radioactivity --- Space environment