Question

A stars apparent brightness on a star depends upon

Answer 1

who is viewing the star and where they are viewing the star from. Brightness depends on three main aspects: 1. How far the star actually is from the viewer (usually measured in light years, since noone currently inhabits space-that we know of) 2. How old the star is and 3. How bright the star actually is. For example, If a person is in Antarctica, and looking at the north star, the star will be very very bright. Versus : If a person is in Brazil, looking at a star that is further away, for example, a star on the constellation Orion, it will be less bright to the viewer because it is potentially billions of light years away. This same star on Orion could actually be brighter than the North Star because it may be a younger star. Younger stars are naturally brighter than older stars that have been burning for millions of years that may be close to becoming a black hole. I hope this helped!