How do the measurements derived from rotation curves fundamentally differ from those derived from gravitational lensing?
Answer
Rotation curves measure the enclosed mass inside a specific radius, while lensing measures the mass distribution across the projected area causing the bending.
Kinematic methods like rotation curves map mass by observing test particles at various radii, whereas lensing integrates the mass effect over the entire line-of-sight projection, making them independent verification tools.
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