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E > E - Pg. 236

236 Glossary how a source changes physically in time. In the con- text of synchrotron blastwaves, it describes the radial evolution of the shock with time. Dynamics: Ejecta: the material ejected in a supernova explosion or a GRB. Electromagnetic event: temporal change of an astrophysical source that gives rise to light or photons, the carrier of electro- magnetic energy. See also electromagnetic spectrum. the full range of energy, wave- length, and frequency of light. Radio light occupies the smallest-energy, longest-wavelength, lowest-frequency portion of the electromagnetic spectrum. Gamma-ray light occupies the highest-energy, shortest-wavelength, highest-frequency of Electromagnetic spectrum: