A Star Is Moving Toward Earth at 90% the Speed

Multiple Choice

A star is moving toward Earth at 90% the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this
Light?

A) 1.2c
B) 0.98c
C) c
D) 0.95c
E) 1.9c