The stars in our sky twinkle in brightness and color because of _.
A)rapid changes in the brightnesses and colors of stars caused by changes in their spectra
B)light pollution
C)the bubbling and boiling of gases on the surfaces of stars
D)turbulence in the Earth's atmosphere

Question

Quizplus · Accepted Answer

The twinkling of the stars is caused by the turbulence in the Earth's atmosphere. As light from a star passes through the different layers of the atmosphere, it is refracted, or bent, by the variations in the temperature and density of the air. This creates a constantly changing path for the light to follow, causing the star's image to appear to be moving and shimmering.

The Stars in Our Sky Twinkle in Brightness and Color