Final answer:
Luminosity of a star is essential for determining its brightness compared to other stars, often measured in relation to the Sun's luminosity.
Explanation:
Luminosity of a star refers to the total energy it emits per second, which is crucial for understanding a star's brightness. The luminosity of stars is often compared to the Sun's luminosity for easy interpretation. Astronomers calculate luminosity based on surface area and energy flux, enabling comparisons among stars.
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