Why did the solar nebula flatten into a disk?
A) The interstellar cloud from which the solar nebula formed was originally somewhat flat.
B) The force of gravity from the Sun pulled the material downward into a flat disk.
C) As the nebula cooled, the gas and dust settled onto a disk.
D) It flattened as a consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones.
E) The force of gravity from the planets pulled the material downward into a flat disk.
D) It flattened as a consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones.
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