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X-rays are electromagnetic radiation which is well above the frequencies of visible light. Their energies give astronomers an indication of the physical conditions causing them. In exactly the same way as a particular wavelength (/frequency) of light informs of a particular energy transition in an atom. This is a direct measure of the chemical make-up in that distant light. From the energy of the x-ray we may infer particular physical processes taking place.

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11y ago

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