Galaxy Rotation Curves

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What is the observed behavior of the rotation curves of galaxies?

  1. The rotation speed of stars in a galaxy increases linearly with distance from the center.
  2. The rotation speed of stars in a galaxy remains constant with distance from the center.
  3. The rotation speed of stars in a galaxy decreases linearly with distance from the center.
  4. The rotation speed of stars in a galaxy increases exponentially with distance from the center.
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