Which Parameter Representing the Motion of the Material in the Spiral

question 287

Multiple Choice

Which parameter representing the motion of the material in the spiral arm of a galaxy is approximately constant and should lead to spiral structure in a galaxy?

• A) linear velocity
• B) inverse of the linear velocity
• C) rotational period around the galactic center
• D) product (velocity)² × (distance to galactic center), following a law equivalent to Kepler's third law for the planets

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