Absolute magnitude is defined as the apparent magnitude that a star would have if:
A) all the energy from the star were concentrated in the visual region.
B) it were located at exactly 10 ly from Earth.
C) it were located at exactly 10 pc from Earth.
D) it were located at exactly 10 AU from Earth.

Question

Quizplus · Accepted Answer

Absolute magnitude is defined as the apparent magnitude that a star would have if it were located at exactly 10 parsecs (32.6 light-years) from Earth. This standard distance allows for a consistent comparison of the luminosity of stars.

Absolute Magnitude Is Defined as the Apparent Magnitude That a Star