Questions A basic observation of a star is how bright it appears. This brightness is known as the star’s More Videos A basic observation of a star is how bright it appears. This brightness is known as the star’s A. absolute magnitude. B. absent magnitude. C. luminosity. D. apparent magnitude. Answer : D. apparent magnitude. Related posts: A Shakespearean play that focuses on the flaws and mistakes of the protagonists is known as a Related Topics: Up Next 11. Which of the following individuals can become a naturalized citizen? 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