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What is luminosity? the amount of energy a star emits in a unit of time the brightness of a star as seen from Earth the average temperature of a star during its life cycle the degree of shift toward the red end of the spectrum.

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LUMINOSITY

   The energy that is emitted by the star per unit time is called luminosity of a star

Luminosity of a Sun:-

   3.8 × 10²⁶ W.

SI unit :-

   It is measured in Watts

   The brightness of a star as seen from the earth means that the brightness of star from 32.6 light-years away ( from earth)

Answer: A) the amount of energy a star emits in a unit of time

Explanation: just took the test

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