a star produces light & a source of something produces that something ->  stars are a source of light  stars are a source of light & as a source of light becomes closer , the light will appear brighter ->  as the stars becomes closer, the light of the stars will appear brighter  the sun is the star that is closest to earth & the stars in the night sky are very far away from the earth ->  the sun is closer to earth than other stars to earth  as the stars becomes closer, the light of the stars will appear brighter & the sun is closer to earth than other stars to earth -> the sun is brighter than other stars because the sun is closer to earth than other stars