What Is Proper Motion

question 96

Multiple Choice

What is proper motion?

• A)It is the true, not apparent, motion of a star in space.
• B)It is the apparent shift as we go to opposite sides of our orbit every six months.
• C)It is the annual apparent motion of a star across the sky.
• D)It is the motion of a star towards or away from us, revealed by Doppler shifts.
• E)It is the orbital motion of a star around the Galaxy.

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