01
Electromagnetic radiation carries most of the information astronomers receive from the universe.
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02
Changing electric and magnetic fields propagate as electromagnetic waves, while quantum interactions exchange energy in photons.
supported03
Observing the same object at multiple wavelengths reveals different components: cool dust is bright in infrared, hot plasma can emit X-rays, synchrotron electrons can radiate radio waves, and ordinary stellar photospheres peak in optical or infrared bands depending on temperature.