Final answer:
The orbits of the planets and satellites in the solar system suggest that the cloud from which the solar system formed was rotating rapidly. The regularities in their motions indicate that the cloud collapsed into a flat disk revolving around the central object. The concentration of mass in the solar system can be inferred from the difference in orbital velocities of the planets.
Step-by-step explanation:
The orbits of the planets and satellites in the solar system provide evidence that the cloud from which the solar system formed was rotating. The orbital motions and spins of the planets and moons are in the same direction as the original spin of the cloud, conserving its angular momentum.
This suggests that the cloud was rotating rapidly, as the planets and satellites have maintained this rotational motion throughout their orbits. The regularities in the motions of the solar system members, such as the counterclockwise orbits and consistent direction of rotation, indicate that the cloud collapsed into a flat disk revolving around the central object, which explains the primary motions in the solar system.
The concentration of most of the mass in the solar system can be inferred from the rotation curve of the planets. The orbital velocities of the planets show that the outer planets move more slowly in their orbits than the planets close to the Sun. This implies that most of the mass is concentrated towards the center, where the Sun is located.