The Proper Motions of Stars Are

question 138

Multiple Choice

The proper motions of stars are

• A) easy to measure for most stars on photographs taken 6 months apart.
• B) noticeable to the unaided eye as a gradual shift of the constellations westward over the course of a month or two.
• C) easy to observe with the unaided eye over the course of an hour or two.
• D) difficult to measure even on photographs taken several years apart for any but the nearest stars.

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