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or is there another scientific source that we can cross check the accuracy of the calculation?

2006-11-29 11:42:57 · 1 answers · asked by goring 6 in Science & Mathematics Physics

1 answers

Actually, the Hubble's Constant determines the rate of expansion of the universe, as well as the critical density for closure of the universe. This is based on Friedman's solutions to Einstein's Field Equations. He calculated that for a flat universe,

ρ(critical) = 3H^2/8πG, where H is the Hubble Constant

To determine the total amount of matter in the Universe (including baryons and dark matter), we have to measure it, and that measurement comes from the CMB (Cosmic Microwave Background). And it's been found that normal and dark matter only accounts for only about 26% of the critical density. This implies the existence of an additional form of energy to account for the remaining 74%. This is how "Dark Energy" was discovered.

2006-11-30 06:00:20 · answer #1 · answered by PhysicsDude 7 · 1 0

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