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Regulus is the most luminous. Regulus is the least luminous. The condition of being bright or having light is defined as luminosity.

What is luminosity?

  • Luminosity, which is an absolute measure of radiated electromagnetic power, is the radiant power emitted by a light-emitting object over time (light).
  • Luminosity is defined as the state of being bright or having light. The sun is an example of something that emits light. (uncountable)
  • The state of being luminous, or a luminous object; brilliance or radiance. The luminosity of an object refers to its brightness.
  • The magnitude of an object in space is frequently used to express its brightness.
  • Astronomers also measure luminosity, or the amount of energy (light) emitted by the surface of a star.
  • Luminosity, which is an absolute measure of radiated electromagnetic power, is the radiant power emitted by a light-emitting object over time.

To learn more about luminosity, refer

https://brainly.com/question/1420078

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