Which of the following is not a factor that affects the apparent brightness of a star as seen from earth?
a. how old the star is
b. how big the star is
c. how hot the star is
d. how far away the star is

A. how old the star is

Explanation:

The brightness of a star can be determined by what we call an Apparent magnitude. Factors that affect the brightness of a star are:

a. How far away the star is

b. The size of the star or how big a star is

c. How hot the star is.

The brightness of a star or its Apparent magnitude as seen from the Earth can be measured or determined by using a scale from -26.8 to +29.

explanation:

newton's third law, for every action there is an equal and opposite reaction.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.