Question

the twinkling effect that is seen when observing stars in the night sky is known as: a. shimmer. b. scattering. c. scintillation. d. reflection.

Explanation:

The twinkling of stars is caused by the refraction of star - light as it passes through different layers of Earth's atmosphere with varying temperatures and densities. This phenomenon is called scintillation. Shimmer is a general term for a glimmering effect, scattering is the spreading of light in different directions by particles, and reflection is the bouncing back of light from a surface.

Answer:

C. scintillation