Which observation supports the theory that the planets formed from a disk shaped nebula?
A) The Sun is the center of the solar system.
B) Pluto and comets follow elliptical orbits that pass inside the orbit of Neptune.
C) The planets revolve around the Sun in approximately the same plane of the ecliptic.
D) The rocky planets are close to the Sun.

Question

Quizplus · Accepted Answer

The fact that the planets all orbit around the Sun in nearly the same plane (the ecliptic) is evidence that they formed from a disk-shaped cloud of material, as all particles in the disk would have been in the same plane and direction of rotation.

Which Observation Supports the Theory That the Planets Formed from a Disk