The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that

Question

Quizplus · Accepted Answer

The plot shows the changing position of one star relative to the other over time, indicating that the stars are in motion relative to one another. The fact that the plot shows a repeating pattern suggests that the stars are in an elliptical orbit around one another. By studying the properties of the orbit and how it affects the motion of the stars, astronomers can estimate the mass of the pair. Therefore, both choices A and B are correct. Choice C is not supported by the plot.

The Two Stars near One Another Are Shown