Multiple Choice
In a visual binary system with circular orbits, if in 20 years the two stars' position angleshave shifted by 30 degrees, the pair's period must be:
A) 60 years.
B) 90 years.
C) 120 years.
D) 240 years.
E) 360 years.
Correct Answer:
Verified
Correct Answer:
Verified
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