Open Universe
(a) Any model of the Universe which does not contain enough matter to halt its expansion.
Open Universe
A model universe in which the average density is less than the critical density needed to halt the expansion of the universe.
Optical Binary ...
open universe Geometry that the universe would have if the density of matter were less than the critical value. In an open universe there is not enough matter to halt the expansion of the universe. An open universe is infinite in extent.
Open Universe
A geometrical model of the universe in which the overall structure of the universe extends infinitely in all directions. The rules of geometry in an open universe are like those that would apply on a saddle-shaped surface.
Opposition ...
OPEN UNIVERSE
An open universe is a model of the universe in which it will expand forever. In this model, there isn't enough matter (and its accompanying gravitational forces) to stop the current expansion.
open universe - (n.)
The version of big bang cosmology in which the universe will expand forever. An open universe has infinite volume.
opposition - (n.) ...
Open Universe: A model of the universe which expands forever and is infinite in space and time, although it begins with a Big Bang. The total mass density of the universe is too small to cause recollapse.
An Open Universe
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STScI
If the Universe is Open or Flat then it will continue to expand for eternity.
14. An open universe has a density _____ the critical value. (Hint)
15. The temperature of the universe, as measured by the cosmic microwave background, is _____ K. (Hint)
REVIEW AND DISCUSSION ...
The ultimate fate of the universe is the same as an open universe. In 2005, the Fermion-boson fate of universe theory was proposed, ...
Compare open universe. [F88]
(e) A universe that has a finite size. Closed universes expand for a finite time, reach a maximum size, and then collapse.
If the density of matter in the Universe is low (an open Universe), self-gravity is insufficient to stop the expansion, and the Universe continues to expand forever (albeit at an ever decreasing rate).
flat universe a universe that stop expanding only after an infinite amount of time (a special case of an open universe). flux the amount of energy passing through a given area (e.g., one square centimeter) in a second.
This would result in a so-called open universe that is infinite in extent.
The size of an open universe is infinite and its geometry will be similar to a hyperbolic surface. The geometry of the universe also affects the sum of angles of a triangle, but we will not dive into this issue.
In these variables, velocities greater than c are certainly possible, and since the open Universes are spatially infinite, they are actually required.
In a way this is very similar to the Open Universe case, except here the Universe will keep slowing down, slowing down, and slowing down, until, far into the future, the expansion is so slow that it isn't observable.
If space has negative curvature, there is insufficient mass to cause the expansion of the universe to stop. In such a case, the universe has no bounds, and will expand forever. This is called an open universe.
up all the stars and galaxies we can see, it also requires adding up all the matter we can't see: the dark matter whose presence is revealed only by the forces it exerts on visible matter. Right now the observations seem to indicate an open universe, ...
of the universe in which the universe first expands (after the big bang), and then contracts, due to the gravitational forces of the matter in the universe. In this model, the universe is finite in space and time. Contrast with an open universe.
A closed Universe would cause parallel rays of light to converge, magnifying the spots. Conversely an open Universe would cause the rays of light to diverge, making the spots appear smaller. Results from BOOMERANG indicate that the Universe is flat.
 See also: Universe, Open, Earth, Time, Galaxies
  
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