yasminparr2700 yasminparr2700

29-10-2019
Physics

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

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shariadavis04 shariadavis04

29-10-2019

Answer: A

Explanation:

Proper Motion is the apparent angular motion of a star across the sky with respect to more distant stars. Typical proper motion is ~0.1 arcsec/year

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