Question

the brightness of a star if it were viewed from a distance of 32.6 light years; used to compare the true brightness of stars is called parallax spectroscopy absolute magnitude apparent magnitude

Explanation:

Absolute magnitude is used to compare the true brightness of stars. It represents how bright a star would appear if it were at a standard distance of 32.6 light - years. Apparent magnitude is how bright a star appears from Earth. Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Parallax is used to measure distances to nearby stars.

Answer:

B. absolute magnitude