Why Did the Solar Nebula Flatten into a Disk

question 158

Multiple Choice

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 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 natural consequence of collisions between particles in the nebula, changing random motions into more orderly ones.

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Definitions:

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