Does Newtonian physics need Dark Matter?

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Offline thedoc

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Does Newtonian physics need Dark Matter?
« on: 18/01/2014 06:30:01 »
Alan Alderson asked the Naked Scientists:
   
Why do most astronomers subscribe to the theory of dark matter when Modfied Newtonian Dynamics seems to solve the problem without requiring any invisible stuff?

Freddie
Lagos, Portugal


What do you think?
« Last Edit: 18/01/2014 06:30:01 by _system »

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Offline Bored chemist

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Re: Does Newtonian physics need Dark Matter?
« Reply #1 on: 18/01/2014 12:20:21 »
"Does Newtonian physics need Dark Matter? "
Yes.
Does 'modified' Newtonian physics need Dark Matter?
It depends on the modification.
But if those modifications don't fit evidence like this
http://en.wikipedia.org/wiki/Bullet_cluster
that would explain why the astronomers look elsewhere for an explanation.
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