Suppose Astronomers Could Examine a Star and Determine Its Apparent

Multiple Choice

Suppose astronomers could examine a star and determine its apparent magnitude M without any intervening gas and dust. Compared to its apparent magnitude measured with gas and dust between Earth and the star, this "clean" measurement of M would be

A) a larger number.
B) a smaller number.
C) the same number.
D) either larger or smaller depending on the star's speed (toward or away) .