What is a star's luminosity? A) amount of energy received per second on 1 m² of a planet's surface exactly 1 au from the star B) total energy emitted by the star into all space per second, measured in watts C) apparent magnitude the star would have if it were located exactly 10 ly from Earth D) apparent magnitude the star would have if it were located exactly 10 pc from Earth

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Luminosity refers to the total amount of energy a star emits into space per second, which is measured in watts. This encompasses all types of electromagnetic radiation emitted by the star, not just visible light.

What Is a Star's Luminosity