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Originally posted by CLPrime
reply to post by theabsolutetruth
Unfortunately, "critical density" isn't as critical as it may sound. It simply means the energy-density which yields a "flat" universe. As stated in the link you provided, the measured density of the universe is within a very small (in fact, negligible) margin of being equal to the calculated critical density. This means the universe is "flat", which also matches observations of the paths of parallel light staying parallel. It also means the universe will not collapse back in on itself. Instead, it will continue expanding. "Critical density" doesn't have the ominous implication's you're implying.
The fact that the universe is expanding then raises the question "Will it always expand?" Since the action of gravity works against the expansion, then if the density were large enough, the expansion would stop and the universe would collapse in a "big crunch". This is called a closed universe. If the density were small enough, the expansion would continue forever (an open universe). At a certain precise critical density, the universe would asymtotically approach zero expansion rate, but never collapse. Remarkably, all evidence indicates that the universe is very close to that critical density. Discussions about the expansion of the universe often refer to a density parameter Ω which is the density divided by the critical density, such that Ω = 1 represents the critical density condition.
Not everything, see the big green-topped rock in the middle?
Originally posted by TheLieWeLive
Everything that was above is now below in an instant while the Methane just gases off into the air.
I think your description regarding the tiller is more accurate than a "crack". When I till my garden, I don't say it has a "crack" in it, just that the surface is disturbed.
It looks like a giant tiller came through there. What else could do that?
Originally posted by AeonStorm
reply to post by pitchdragon
Cool! Thanks for sharing! A fissure Are there any volcanoes around this area? If so that might easily explain this phenomena... if not...then perhaps not so easily.
Originally posted by liveandletlive
How often does this happen? If its methane gas being released from the ground then the next question would be why the earth is suddenly burping up gas? Seems like there is an increase in this kind of activity.
Originally posted by CLPrime
reply to post by theabsolutetruth
You were implying that the universe reaching critical density is something that could be compared with the other potentially devastating things we've been seeing lately. I assumed that meant you saw the accelerated expansion of the universe as equally important, so I apologize if that wasn't your intention.
The universe is not "approaching" critical density. The universe is already at critical density, and always has been. If the density of the universe at its formation had been less, the geometry of the universe would be hyperbolic...it would be "open". If the density had been more, the universe would be spherical, or "closed", and would result in the "Big Crunch". However, the density appears to be exactly equal to the critical density, which produced the "flat" universe we see.
The density isn't approaching anything. It is what it is.
The ultimate fate of the universe is a topic in physical cosmology. Many possible fates are predicted by rival scientific theories, including futures of both finite and infinite duration. Once the notion that the universe started with a Big Bang became accepted by a consensus of scientists, the ultimate fate of the universe became a valid cosmological question, one depending upon the physical properties of the mass/energy in the universe, its average density, and the rate of expansion.
The current scientific consensus of most cosmologists is that the ultimate fate of the universe depends on its overall shape, how much dark energy it contains, and on the equation of state which determines how the dark energy density responds to the expansion of the universe.[citation needed] Recent observations have shown that, from 7.5 billion years after the Big Bang onwards, the expansion rate of the universe has actually been increasing, concurrent with the Open Universe theory.
The fate of the universe is determined by the density of the universe. The preponderance of evidence to date, based on measurements of the rate of expansion and the mass density, favors a universe that will continue to expand indefinitely, resulting in the "big freeze" scenario below.[3] However, new understandings of the nature of dark matter also suggest its interactions with mass and gravity demonstrate the possibility of an oscillating universe.
Choosing among these rival scenarios is done by 'weighing' the universe, for example, measuring the relative contributions of matter, radiation, dark matter and dark energy to the critical density. More concretely, competing scenarios are evaluated against data on galaxy clustering and distant supernovae, and on the anisotropies in the Cosmic Microwave Background.
Peru’s national agency for civil defense, Indeci, has organized the first nighttime earthquake and tsunami drill on a national level, with the goal of preparing the public for a nighttime event that involves the participation of families in their respective homes.