if the density of the universe is at the critical density, this means that:

The expansion of the hole in the form of 3-D growing globes/holes totally depends on the density parameter. The critical density = 3 H 2 /(8 p G ), where H is the Hubble parameter for our cosmological time. Start studying Chapter 26 Astronomy Vocab. The current scientific consensus is that the Universe expanded from a point of super high matter and energy density roughly 13.8 billion years ago. This means that its density appears to be close to the critical density, which is the density needed for gravity to just halt its expansion after an infinite time. A Universe with the critical density is said to be flat. The density parameter, , is defined as the ratio of the actual (or observed) density to the critical density of the Friedmann universe.

Helium production outside stars Universe was hot, at least 3x109K to fuse 4H He, to overcome a potential barrier of 1MeV. This is equivalent to a mass density of 9.9 x 10 -30 g/cm 3, which is equivalent to only 5.9 protons per cubic meter.

Critical plasma density, the density at which the plasma frequency equals the frequency of an electromagnetic electron wave in plasma. "Since the exact density of the universe is not known yet, different sources gave different results. If the density of the universe is lower than the critical density this means that. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Critical density (thermodynamics), the density of a substance at its thermodynamic critical point. Universe was smaller.

Nearly Uniform Radiation 3K Background (CMB) Universe has cooled, hence expanded by at least a factor 109. The ' critical density ' is the average density of matter required for the Universe to just halt its expansion, but only after an infinite time.

18) If the density of the universe is lower than the critical density this means that A) the universe is expanding at a rate equal to the escape speed of the universe. Whatever the story means that was my motive to ask about the density of the Universe.

It actually comes out as a parameter in the Friedmann equation for the expansion of the universe. B) the universe is expanding at a rate less than the escape speed of the universe.

When the universe is at the critical density, it means that the universe will expand at precisely the right rate to avoid recollapse thus forming a "flat universe.

In his theory of general relativity, Einstein demonstrated that the gravitational effect of matter is to curve the surrounding space.

If the density of the universe is at the critical density this means that. When we compare the true density of the universe to the 'critical density', we determine whether we live in a 'closed,' 'flat,' or 'open' universe. 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). When we compare the true density of the universe to the 'critical density', we determine whether we live in a 'closed,' 'flat,' or 'open' universe.

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