It is a phenomenon whereby the vibrations of a light ray, which, as is known, occur in all normal planes to the direction of propagation of the latter, are preferably performed in a single determined plane, which is called precisely a polarization plane. .

His discovery is due to the Dutch Christiaan Huygens.

Light radiation from celestial sources can be polarized when it is reflected by interstellar dusts, or by a gas and dust nebula like the one surrounding the Pleiades star cluster. The degree of polarization of light can be measured with appropriate instruments equipped with polarizing filters.

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Polar (star)Celestial poles