GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The mass-energy density of the Universe is ____
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70% dark energy; 29% matter/dark matter; <1% light.
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70% dark energy; 29% light; <1% matter/dark matter.
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100% dark energy
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70% dark matter; 15% dark matter, 15% light.
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Explanation:
Detailed explanation-1: -WMAP determined that the universe is flat, from which it follows that the mean energy density in the universe is equal to the critical density (within a 0.5% margin of error). This is equivalent to a mass density of 9.9 x 10-30 g/cm3, which is equivalent to only 5.9 protons per cubic meter.
Detailed explanation-2: -Dark energy’s density is very low: 6×10−10 J/m3 ( 7×10−30 g/cm3), much less than the density of ordinary matter or dark matter within galaxies. However, it dominates the universe’s mass–energy content because it is uniform across space.
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