Question

Explain why the planets do not twinkle.

• A. Due to atmospheric refraction.
• B. Planets are large in size.
• C. Planets do not emit light of their own.
• D. Planets have a larger angular width.

Answer 1

The correct option is D Planets have a larger angular width.

When light reflected from a planet reaches the earth's atmosphere, it undergoes refraction. However, the planets have a larger angular width as compared to stars. So, the apparent shift in their position is negligible and they continue to appear at their original position. Hence, they do not twinkle.