In a Visual Binary System with Circular Orbits, If in 20

question 61

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.

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