A basic observation of a star is how bright it appears. This brightness is known as the star's

A. apparent magnitude.

B. absent magnitude.

C. its not C.

D. absolute magnitude.

I believe the correct answer from the choices listed above is option A. A basic observation of a star is how bright it appears. This brightness is known as the star's apparent magnitude. It is a term used to measure the magnitude of a celestial object as it is actually measured from the earth.