A model of the universe in which the curvature of space is such that straight lines eventually curve back upon themselves; in this model, the universe expands from a big bang, stops, and then contracts to a big crunch.
A possible state of the universe. In this state, the expansion of the universe will eventually be reversed; it is characterized by positive curvature, being finite in extent but having no boundaries. Recent observations indicate that this is unlikely to be the true state of our universe.
A cosmological model in which the Universe is finite, and will eventually recollapse. The density of this Universe is more than the critical density.
a cosmological model of the Universe with a finite volume in which space is positively curved and for which sufficient matter exists to stop the expansion of the Universe by mutual gravitational attraction.
a universe with enough matter (gravity) to eventually stop the expansion and recollapse (it has a ``closed future'').
(cosmology) a universe in which there is sufficient matter to halt the expansion that began with the big bang and to cause the universe to collapse again; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter
Geometry that the universe as a whole would have if the density of matter is above the critical value. A closed universe is finite in extent, and has no edge, like the surface of a sphere. It has enough mass to stop the present expansion, and will eventually collapse.
A model universe in which the average density is great enough to stop the expansion and make the universe contract.
A model 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.
An expanding universe with sufficient density that gravity eventually halts the expansion and forces a collapse.
A model Universe that stops expanding at some time in the future, after which it contracts to a point much like that from which it began.