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In a simple two-star system, in which the two stars are bound by mutual gravitation, each star orbits around a mutual center of mass. The star with the lower mass receives greater acceleration and hence has a larger orbit.

What does this information tell you about the illustration’s features?

Explanation

The star with the greater mass must have the smaller orbit, which means that Star 1 has the greater mass. Both stars must orbit around the center of mass, and so that center must be within region B.

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