Deuterium abundance suggests that normal matter makes up only 3- 4% of the critical density.

Name: Deuterium abundance suggests that normal matter makes up only 3- 4% of the critical density.
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Deuterium abundance, along with observations of the cosmic microwave background and the distribution of galaxies, suggests that normal (baryonic) matter constitutes about 3-4% of the total energy density of the universe, with the rest being dark matter and dark energy.

Deuterium Abundance Suggests That Normal Matter Makes Up Only 3-