Question

The brightness of a star depends on its (color, composition of atmosphere, or distance from earth), and stars that are closer look (brighter, dimmer, or white).

Answer 1

Answer:

Distance, Brighter

Explanation:

Think of a flash light, one close and one far which is brighter and which is dimmer.  

Hope this is what your teacher put as the answer!

Answer 2

Answer:

Distance, brighter  

Explanation:

Brightness depends upon the amount of power that is radiated by a star

This in turn follows the inverse square law. That is, as the distance from the object increases, brightness decreases as the square of the distance.

Color depends on the composition of the star's radiation.

When the stars are bright, it can be understood that they are closer, compared to other stars.