A Jansky (symbol: Jy) is a unit of measurement used in radio astronomy to express the flux density of electromagnetic radiation. It is named after the American engineer and radio astronomer Karl Jansky, who is often credited with the discovery of cosmic radio waves in the early 1930s. One Jansky is defined as \( 10^{-26} \) watts per square meter per hertz (W/m²/Hz).
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