Stars in the sky appear to twinkle due to _________?

A. a series of refractions
B. a series of reflections
C. a surface tension phenomenon
D. multiple diminishing brightness

Explanation:

The stars twinkle in the night sky because of the effects of our atmosphere. When starlight enters our atmosphere it is affected by winds in the atmosphere and by areas with different temperatures and densities. This causes the light from the star to twinkle when seen from the ground.