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The high-energy cosmic rays are samples of material from outside the solar system. The elemental and isotopic compositions of the cosmic rays constrain the models for element production in a variety of astrophysical sources.
Salem Press Encyclopedia of Science, 2022. 3p.
As the twentieth century began, a series of discoveries of surprising radiations marked a new direction in physics. In 1895, Wilhelm Conrad Röntgen had created X rays within an evacuated tube in his laboratory, and then Antoine-Henri Becquerel discovered radioactive rays emitted from elements in the earth; this discovery led Marie and Pierre Curie to discover radium. Victor Franz Hess undertook a search for the sources of radioactivity, and this led him, instead, to discover a new and more... więcej
Salem Press Encyclopedia, 2023. 3p.
