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.

Question

Quizplus · Accepted Answer

The Answer of 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.

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