how does dark matter allow a galaxy to have a constant rotation?

Subject: how does dark matter allow a galaxy to have a constant rotation?

Date: Tue Mar 9 12:00:20 2010
Posted by Christina K
Grade level: nonaligned School: No school entered.
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Area of science: Astronomy
ID: 1268161220.As

Message:


Just watched a clip about dark matter.

Re: how does dark matter allow a galaxy to have a constant rotation?

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