By looking at the rotation curve of the Solar System and comparing it to the examples we discussed in Section 8.1, you will notice that the motion of the planets in orbit around the Sun resembles the ...By looking at the rotation curve of the Solar System and comparing it to the examples we discussed in Section 8.1, you will notice that the motion of the planets in orbit around the Sun resembles the motion of water swirling around a drain. Despite having nearly all the mass in the solar system, the sun is relatively tiny in extent; the diameter of the Sun is much, much smaller than the distances between the planets and the Sun.
