Which statement about stellar motion is incorrect?
A)In general, the closer a star is, the more its proper motion.
B)The radial velocity is measured by the Doppler shift.
C)The transverse velocity is measured by the proper motion and the distance.
D)Like parallax, proper motion is measured over intervals of exactly six months.
E)The Pythagorean theorem relates space, transverse, and radial velocities.

Question

Quizplus · Accepted Answer

Proper motion is measured over intervals of at least six months, but not necessarily exactly six months. Proper motion is measured over intervals of one year, not exactly six months.

Which Statement About Stellar Motion Is Incorrect