Question

which statement accurately describes binary star systems?
○ they have more than two stars.
○ they have stars that are always visible.
○ they include large groups of stars.
○ they have stars that might appear to wobble.

Explanation:

• Binary star systems consist of two stars orbiting a common center of mass. The gravitational pull between them can cause the stars to appear to wobble from an Earth-based perspective as they move.
• The first option is incorrect because binary systems have exactly two stars, not more.
• The second option is incorrect because some binary stars are eclipsing or too faint to be always visible from Earth.
• The third option is incorrect; large groups of stars are star clusters, not binary systems.

Answer:

D. They have stars that might appear to wobble.