Which statement about stellar motion is incorrect?
A) Proper motion is measured in intervals of six months.
B) The space velocity can be found from the radial and transverse velocities.
C) You must also know the parallax to get the transverse velocity.
D) Radial velocity is measured by the Doppler shifts of the spectral lines.
E) The closer stars usually show larger proper motions.

Question

Quizplus · Accepted Answer

Proper motion is measured over years or decades, not in intervals of six months, to accurately track the apparent motion of stars across the sky relative to other, more distant stars.

Which Statement About Stellar Motion Is Incorrect