The BIG Newtonian Problems

1. Unstable!
   Disc galaxies should have collapsed by now.


2. Velocity profile cannot remain flat!
   Newtonian constant V solution needs
   An exponential drop at large radii is too fast for V to be constant.

• Dark Matter.
  
  
• Modification of Newtonain Dynamics (MOND).

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  sweetser@alum.mit.edu