Question

Which of the following statements is true? O A. Stars that are further away always appear more dim than closer stars. B. The luminosity ('intrinsic brightness") of stars decreases with distance from the observer. C. The "colour" of a star is related to its distance. 0 D. The difference between the measured ("apparent") brightness of a star and its intrinsic brightness allows you to calculate its distance. Reset Selection

Answer 1

Measured brightness or apparent brightness of a star is the brightness of a star measured from Earth or which is visible to us. Intrinsic brightness is the actual brightness of the star which is also known as luminosity. The difference between the apparent brightness and intrinsic brightness is the distance between the star and the Earth. Hence the answer is D.