A star's absolute magnitude and its apparent magnitude have the same numerical value. How far is this star from Earth?
A) It is not possible for a star to have the same absolute and apparent magnitudes.
B) The star would have to be an infinite distance away.
C) 10 ly
D) 10 pc

Question

Quizplus · Accepted Answer

The star is 10 parsecs away from Earth. Absolute magnitude is defined as the apparent magnitude a star would have if it were 10 parsecs from Earth. If a star's absolute magnitude and apparent magnitude are the same, it means it is exactly 10 parsecs away.

A Star's Absolute Magnitude and Its Apparent Magnitude Have the Same