Big Crunch
In physical cosmology, the Big Crunch is a hypothesized collapse of the universe upon itself after its expansion eventually stops — a counterpart to the Big Bang.
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The Big Crunch
A Closed Universe
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STScI
If there is enough matter in the Universe eventually gravitational forces will stop its expansion.
0 is the critical value (Omega1 implies Big Crunch). We can see the gravitational influence of about Omega~0.4 of matter, but the visible stars and galaxies only amount to Omega~0.05 --- the remainder, Omega~0.
Big Crunch- the ultimate collapse of the universe that may take place in the future if the universe starts to contract
Binary system- system of two stars that orbit around each other ...
Big Crunch
(a) The state of extremely high density and temperature into which a closed universe will recollapse in the distant future.
BIG CRUNCH
The big crunch is the collapse of all of the matter in the universe - a reversal of the big bang.
The Big Crunch
If the gravitational attraction of all the matter in the observable horizon is high enough, then it could stop the expansion of the universe, and then reverse it.
Big Crunch
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Big Crunch
In physical cosmology, the Big Crunch is one possible scenario for the ultimate fate of the universe, in which the metric expansion of space eventually reverses and the universe recollapses, ...
The Big Crunch as the fate of the Universe was explored in science fiction as early as Poul Anderson's 1970 novel Tau Zero which posits a cyclic universe where the big crunch will be surrounded by a cloud of hydrogen, ...
Galaxies would start getting closer, and they would all head for a Big Crunch. It is also possible that a closed Universe could experience another Big Bang after the Big Crunch.
Depending on the average density of matter and energy in the universe, it will either keep on expanding forever or it will be gravitationally slowed down and will eventually collapse back on itself in a "Big Crunch".
We cannot penetrate forward in time beyond the singularity at the Big Crunch any more than we can probe backward past the Big Bang"the laws of physics as we presently understand them are simply inadequate to describe these extreme conditions.
It was often thought that there could be an infinite series of bigbangs followed by big crunches, so that a closed model could, in some sense, be eternal.
Some scientists think that the Universe will end in a Big Crunch. A handy way of saying that it will contract until it doesn't exist anymore. That will be followed by a Big Bang and a new Universe will begin.
Assuming that the Big Crunch or Big Rip scenarios for the end of the universe do not occur, calculations suggest that the gravity of passing stars will have completely stripped the dead Sun of its remaining planets within 1 quadrillion (1015) years.
The universe ends in a ``big crunch.'' And that is it, as far as we know. The universe has a finite spatial extent and a finite time. In open models, the universe is infinite in size and time, and it keeps expanding without end.
Recent observations of distant stellar explosions seem to indicate that the Big Crunch is not in our future. In fact, the expansion of the universe is speeding up, goaded by a mysterious "dark energy."
MACHOs and WIMPs ...
L'univers se contractera jusqu'à ce qu'il atteigne un état infiniment petit et dense semblable à celui où le Big Bang a eu lieu. Ce point est appelé le Big Crunch. En théorie, le cycle d'expansion et de contraction se poursuit ainsi.
If not, some speculated, a time may come when the expansion would stop, after which gravity will gain the upper hand, pulling all mass (and space) together again. The universe would then end in a "Big Crunch," a mirror image of the Big Bang, ...
 See also: Universe, Time, Big Bang, Gravitation, Light
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