The sun generates a broad electromagnetic (EM) spectrum, primarily through hydrogen fusion and other reactions, resulting in the perception of white light, which is a combination of all visible frequencies. While the sun emits light across the spectrum, it does so unevenly, with hotter stars producing broader spectra and whiter light. Pulsars and black holes emit primarily in the radio range due to synchrotron radiation from their intense magnetic fields, while gamma and X-ray emissions arise from the heat of compression and friction of infalling matter. Once stars exhaust fusion reactions, they cease to produce visible light.
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