Luminosity generally refers to the intrinsic brightness of an object, particularly in the context of astronomy. It is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time, typically measured in watts or in solar luminosities (where one solar luminosity is the luminosity of the Sun).
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Luminosity is the total radiative energy emitted by an astronomical source per unit time. It differs from the received radiative flux, which also depends on distance and geometry.