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Assuming the mass of the stars and gas within NGC 5055 is $8\times10^{10} M_{sun}$. What is the percentage of the dark matter in it?

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closed as unclear what you're asking by peterh, Kyle Oman, Kyle Kanos, innisfree, Jon Custer Feb 27 '17 at 14:01

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ The percentage of the punctuations in your text is exactly 0% and it is clearly visible that you dont even try to formulate a clear question this is why your question is now it the very low quality review queue I suggest to fix it ASAP $\endgroup$ – peterh Feb 27 '17 at 1:02
  • $\begingroup$ Yeah this question demonstrate very little effort and also provides very little conceptual elements. $\endgroup$ – ZeroTheHero Feb 27 '17 at 5:19
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As a first estimate you can use the cosmological ratio of dark matter to baryonic matter which is about 5 to 1. So the mass of dark matter would be $4*10^{11} M_{\rm sun}$. This will probably be a slight over estimate as galaxies generally have a slightly lower ratios compared to the cosmological average. A more accurate estimate can be inferred from the line of sight velocities of the stars in NGC 5055.

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