Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the photon

A photon is a quantum of electromagnetic radiation. Electromagnetic radiation, such as light, behaves as if it is made up out of a stream of individual photons. All photons of a particular color (wavelength, frequency) have the same amount of energy, which is proportional to the frequency of the radiation.