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The true brightness of an object is called its a. luminosity. b. intensity. c. magnitude. d. viscosity.

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The luminosity of an object is called its luminosity. It is the total amount of energy emitted by bright or meteoric objects over time. It has the SI unit of joules per second or watts. So the answer is the letter A. Intensity is the measure of how strong the substance or object is when it throws something. Size is a measure of how big the object produces. Viscosity is a measure of the flow of a substance.