Question

question 4
what is the difference between apparent magnitude & absolute magnitude?
absolute magnitude pretends every star is at a standard 10 pc away.
apparent magnitude is how bright a star really is.
apparent magnitude can only be determined from parallax.
absolute magnitude is larger for supergiant stars than for any other type of star.

Explanation:

Apparent magnitude is how bright a star appears from Earth. Absolute magnitude is the brightness a star would have if it were at a standard distance of 10 parsecs (pc) away. Parallax is used for distance - related measurements but not the only way to determine apparent magnitude. Supergiant stars have high luminosity but absolute magnitude is not always larger just because it's a supergiant compared to all other stars.

Answer:

A. Absolute magnitude pretends every star is at a standard 10 pc away.