What conclusion can we draw about the motion of a star that does not show any Doppler shift in its spectrum?
A) The star is not moving.
B) The star is spinning fast.
C) The star does not have a magnetic field.
D) The star may be moving perpendicular to our line of sight.
E) We cannot draw any conclusions about the motion of this star.

Question

Quizplus · Accepted Answer

If a star is moving perpendicular to our line of sight, it will not show any Doppler shift because the Doppler effect only occurs when there is motion along the line of sight.

What Conclusion Can We Draw About the Motion of a Star