A star is moving toward Earth with a speed of 0.9 c (90% the speed of light).It emits light,which moves away from the star at the speed of light.Relative to us on Earth,the speed of the light moving toward us (emitted by the star)is
A)c.
B)1.9 c.
C)1.2 c.
D)0.98 c.

Question

Quizplus · Accepted Answer

According to the theory of relativity, the speed of light in a vacuum is always constant at c, regardless of the motion of the source or the observer.

A Star Is Moving Toward Earth with a Speed of 0.9