Question

To an observer on Earth the stars appear to twinkle. This is due to

• A. frequent absorption of star light by earth's atmosphere.
• B. the fact that stars do not emit light continuously.
• C. frequent absorption of star light by their own atmosphere.
• D. the fluctuation of physical conditions in the earth's atmosphere.

Answer 1

The correct option is D

the fluctuation of physical conditions in the earth's atmosphere.

To an observer on Earth, the stars appear to twinkle because the physical conditions in the earth's atmosphere are not stationary.