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It's because of the relative magnitude of the star's luminosity. If you are looking at a star from Earth that is about 4 light years away, it will appear much brighter than the same kind, type, and age of star that is 8 light years away. Though the absolute magnitude of both of those stars may be the same (absolute magnitude is the brightness of a star at about 36.2 light years away from earth), the relative magnitude is different because of the distance of both stars.

It is a combination of their actual brightness, size and distance.

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