I don't understand it well enough to explain it -- perhaps someone can step in here with a clear explanation -- but apparently specific information can be drawn from careful measurements of the CMBR to enable the following conclusion:
Quote:
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The clear detection of the predicted acoustic peak structure implies that the dark matter is non-baryonic.
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This statement comes from the Conclusion section of the
Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology.