The following diagrams are supposed to represent the solar system, with the Sun in the center and two planets orbiting it. The left diagram is a diagram without dark matter, while the right diagram shows the solar system embedded in a huge cloud of dark matter that is much much bigger than the solar system.

    A ) Star A should be moving faster than star B because it is experiencing a stronger force of gravity
    B) Star B should be moving faster than star A because it is experiencing a stronger force of gravity
    C) Both stars A and B should be moving at the same speed
    D) You can't tell from the information given which star is moving faster

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