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The Critical Density of the Universe Imagine setting up two incredibly powerful lasers so they are parallel to each other, and shooting off parallel laser beams into the universe. For our own Milky Way, that means that the dark matter density is the highest towards the very center of the galaxy, and out near our solar system, the dark matter density is significantly lower. Dark matter’s composition is a major mystery, but it may be due to the suspected mass of neutrinos or a completely unknown type of leptonic matter. We are very close to critical density - Inflation to rescue - The overall geometry of the universe is closely related to total density of matter and energy - Density critical = flat (critical) geometry - Density greater than critical = spherical (closed) - Density less than critical = saddle-shaped (open) An open universe is negatively curved, a closed universe is positively curved, whereas a universe with exactly the critical density is flat. c. Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster. Dark matter is present between galaxies in clusters, but not within individual galaxies. d. Dark matter is the dominant form of mass in both clusters and in individual galaxies. dark matter is the densest matter in the universe .it is present in a large amount in the universe. dark matter is the densest matter in the universe .it is present in a large amount in the universe. In a Universe where the density of matter is the ‘critical density’ (flat space), locally parallel lines remain parallel. The critical density for the Universe is approximately 10 -26 kg/m 3 (or 10 hydrogen atoms per cubic metre) and is given by: where H is the Hubble constant and G …
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