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The End of the Universe  Big Crunch, Big Freeze or Big Rip
The End of the Universe Big Crunch, Big Freeze or Big Rip
Published: 2014/09/23
Channel: Universe TV
Pickle ASMR Eating Sounds 👅  Big Crunch😻 Intense
Pickle ASMR Eating Sounds 👅 Big Crunch😻 Intense
Published: 2017/02/23
Channel: ASMRTheChew
The Big Crunch theory
The Big Crunch theory
Published: 2014/09/06
Channel: DJolyfun
Michio Kaku: What
Michio Kaku: What's the Fate of the Universe? It's in the Dark Matter
Published: 2012/11/08
Channel: Big Think
5 Theories On How The Universe Will End!
5 Theories On How The Universe Will End!
Published: 2016/09/28
Channel: Top 5s Finest
Pickle ASMR Eating Sounds 👅  BIG Crunch😻 Intense
Pickle ASMR Eating Sounds 👅 BIG Crunch😻 Intense
Published: 2017/04/27
Channel: ASMRTheChew
Doing It Big With Oreo
Doing It Big With Oreo's New Big Crunch Bar
Published: 2016/11/18
Channel: Chris Clarke
10 Datos Importantes Sobre la Teoria del Big Crunch: El fin del Universo
10 Datos Importantes Sobre la Teoria del Big Crunch: El fin del Universo
Published: 2016/04/10
Channel: TOPDARK Channel
3 Scary Ways That Our Universe Could End
3 Scary Ways That Our Universe Could End
Published: 2014/05/11
Channel: TheVendor101
BIG BANG, BIG CRUNCH, BIG RIP Y EL FIN DEL UNIVERSO
BIG BANG, BIG CRUNCH, BIG RIP Y EL FIN DEL UNIVERSO
Published: 2014/08/14
Channel: MyPrideInTheClouds
Vol 8! BIG CRUNCH chiropractic adjustment compilation
Vol 8! BIG CRUNCH chiropractic adjustment compilation
Published: 2016/03/29
Channel: CC Compilations
Big Bang & Big Crunch
Big Bang & Big Crunch
Published: 2009/02/03
Channel: Kurdistan Planetarium
KFC Big Crunch Taste Test | KBDProductionsTV
KFC Big Crunch Taste Test | KBDProductionsTV
Published: 2012/02/06
Channel: KBDProductionsTV
Big crunch - El Universo
Big crunch - El Universo
Published: 2012/10/21
Channel: lanoepotoma11
People Try The New Oreo Big Crunch Bar
People Try The New Oreo Big Crunch Bar
Published: 2016/11/26
Channel: BuzzFeedVideo
The Big Crunch Theory
The Big Crunch Theory
Published: 2016/04/12
Channel: infindo ∞
Big Freeze.  Big Rip.  Big Crunch.  How Will The Universe End?
Big Freeze. Big Rip. Big Crunch. How Will The Universe End?
Published: 2017/02/19
Channel: GEEK SEES WORLD
Asi Podria Ser El Fin Del Universo | Teoria Big Crunch | La Gran Implosión | Gran Colapso
Asi Podria Ser El Fin Del Universo | Teoria Big Crunch | La Gran Implosión | Gran Colapso
Published: 2017/04/15
Channel: ԱГԱԌԱѦүѺСӉѦИҬѦ
Documentaire Du Big Bang au Big Crunch (French)
Documentaire Du Big Bang au Big Crunch (French)
Published: 2012/08/04
Channel: Happy2bmuslim93
Funniest 911 Call Ever 2 - Big Crunch
Funniest 911 Call Ever 2 - Big Crunch
Published: 2012/06/28
Channel: Hunter Collins
Alpha.Centauri.-.175.-.Was.ist.der.Big.Crunch
Alpha.Centauri.-.175.-.Was.ist.der.Big.Crunch
Published: 2013/03/04
Channel: TheLordOfDeath1000
Big Chill ou Big Crunch
Big Chill ou Big Crunch
Published: 2011/02/16
Channel: Dubigbangauvivant
Another BIG BANG after The BIG CRUNCH in The Quran - Cyclic Universe Theory
Another BIG BANG after The BIG CRUNCH in The Quran - Cyclic Universe Theory
Published: 2012/06/07
Channel: Quran Now
L
L'UNIVERSO STA MORENDO - BIG RIP - BIG FREEZE - BIG CRUNCH
Published: 2015/08/12
Channel: [OBY] Divulgazione Scientifica
La Fin de l
La Fin de l'Univers | Le Big Crunch | Documentaire
Published: 2016/06/29
Channel: Juste Pour Info
O Big Crunch
O Big Crunch
Published: 2007/11/16
Channel: Matheus Campos
Big Crunch Amp Repair - tech interviews
Big Crunch Amp Repair - tech interviews
Published: 2015/05/05
Channel: BigCrunchBrooks
Quatro Cenários Para o Fim do Universo - Space Today TV Ep.279
Quatro Cenários Para o Fim do Universo - Space Today TV Ep.279
Published: 2016/06/10
Channel: SpaceToday
The Three Knob by Big Crunch - guitar amp demo
The Three Knob by Big Crunch - guitar amp demo
Published: 2013/05/18
Channel: BigCrunchBrooks
KFC Big Crunch Taste Test "UNCUT & RAW!" (YES! it
KFC Big Crunch Taste Test "UNCUT & RAW!" (YES! it's UNEDITED FOOTAGE!)
Published: 2016/12/13
Channel: KBD UNCUT & RAW
DIY GIANT OREO BIG CRUNCH BAR
DIY GIANT OREO BIG CRUNCH BAR
Published: 2016/11/29
Channel: Dylan & Yana
(In Hindi) हमारे ब्रह्मांड का अंत केसे होगा ? | Big Rip, Big Crunch, Big Freeze, Big Slurp.
(In Hindi) हमारे ब्रह्मांड का अंत केसे होगा ? | Big Rip, Big Crunch, Big Freeze, Big Slurp.
Published: 2017/02/16
Channel: Aakash Gautam
Convergence: The Big Crunch
Convergence: The Big Crunch
Published: 2011/05/03
Channel: 3nilgr
BIG BANG-BIG CRUNCH
BIG BANG-BIG CRUNCH
Published: 2008/08/15
Channel: JavierCiencias
Big Crunch theory science project
Big Crunch theory science project
Published: 2015/12/08
Channel: Isabella Pasco
Can The Big Crunch Theory Be Proven?
Can The Big Crunch Theory Be Proven?
Published: 2012/01/18
Channel: Social Media Marketing Tips
The Great Big Crunch
The Great Big Crunch
Published: 2016/09/29
Channel: Healthy Kids Community Challenge Burlington
The Big Crunch Theory
The Big Crunch Theory
Published: 2013/12/02
Channel: zimmercj
The BIG Crunch - CTK Promotional Video
The BIG Crunch - CTK Promotional Video
Published: 2017/03/07
Channel: Robert Cannone
ASMR BIG CRUNCH Test! ASMR Eating Sounds Pickle, Cucumber, Kimchi
ASMR BIG CRUNCH Test! ASMR Eating Sounds Pickle, Cucumber, Kimchi
Published: 2017/05/25
Channel: Mukbang Monday
Documentary BBC The End of the Universe Big Crunch, Big Freeze or Big Rip BBC Universe Documentary
Documentary BBC The End of the Universe Big Crunch, Big Freeze or Big Rip BBC Universe Documentary
Published: 2016/04/22
Channel: Documentary Life
Cracker UK Season 2 Episode 6 The Big Crunch: Part 3 Watch Online ♥
Cracker UK Season 2 Episode 6 The Big Crunch: Part 3 Watch Online ♥
Published: 2015/11/21
Channel: Marci Tapp
Cracker 5   The Big Crunch
Cracker 5 The Big Crunch
Published: 2016/01/22
Channel: Dahlia Una
UFC Golden Fiesta Big Crunch Fry & Shake 30s TVC 2017
UFC Golden Fiesta Big Crunch Fry & Shake 30s TVC 2017
Published: 2017/06/11
Channel: My Julia Advertising & etc.
Al salir me esperas. Capítulo 01x10: Big Crunch
Al salir me esperas. Capítulo 01x10: Big Crunch
Published: 2016/06/28
Channel: Al salir me esperas
BRAND NEW OREO MILKA BIG CRUNCH BAR REVIEW | THE SHOWSTOPPER SHOWS
BRAND NEW OREO MILKA BIG CRUNCH BAR REVIEW | THE SHOWSTOPPER SHOWS
Published: 2016/11/17
Channel: The Showstopper Shows
The Great Big Crunch
The Great Big Crunch
Published: 2015/10/13
Channel: Sing Along Tim TV
The Big Crunch Theory - Distortion (DJ Koze Remix)
The Big Crunch Theory - Distortion (DJ Koze Remix)
Published: 2010/03/16
Channel: Versatile Records
Will the Big Crunch Happen?
Will the Big Crunch Happen?
Published: 2017/05/28
Channel: AstroFocus
TRYING OREO CANDY BARS!
TRYING OREO CANDY BARS!
Published: 2016/11/20
Channel: Lamarr Wilson
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WIKIPEDIA ARTICLE

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An animation of the supposed behaviour of a Big Crunch

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, ultimately causing the cosmic scale factor to reach zero or causing a reformation of the universe starting with another Big Bang. Sudden singularities and crunch or rip singularities at late times occur only for hypothetical matter with implausible physical properties.[1]

Overview[edit]

If the universe's expansion speed does not exceed the escape velocity, then the mutual gravitational attraction of all its matter will eventually cause it to contract. If entropy continues to increase in the contracting phase (see Ergodic hypothesis), the contraction would appear very different from the time reversal of the expansion. While the early universe was highly uniform, a contracting universe would become increasingly clumped.[2] Eventually all matter would collapse into black holes, which would then coalesce producing a unified black hole or Big Crunch singularity.

The exact details of the events that would take place before such final collapse depend on the length of both the expansion phase as well as the previous contraction phase; the longer both lasted, the more events expected to take place in an ever-expanding universe would happen; nonetheless it's expected that the contraction phase would not immediately be noticed by hypothetical observers because of the delay caused by the speed of light, that the temperature of the cosmic microwave background would rise during contraction symmetrically compared to the previous expansion phase, and that the events that took place during the Big Bang would take in opposite order.[3] For a contracting Universe similar to ours in composition it's expected that superclusters would merge among themselves followed by galaxy clusters and later galaxies. By the time stars were so close together that collisions among them were frequent, the temperature of the cosmic microwave background would have increased so much that stars would be unable to expel their internal heat, slowly cooking until they exploded leaving behind a hot and highly heterogeneus gas, whose atoms would break down in their constituent subatomic particles because of the increasing temperature, that would be absorbed by the already coalescing black holes before the Big Crunch itself.[3]

The Hubble Constant measures the current state of expansion in the universe, and the strength of the gravitational force depends on the density and pressure of matter in the universe, or in other words, the critical density of the universe. If the density of the universe is greater than the critical density, then the strength of the gravitational force will stop the universe from expanding and the universe will collapse back on itself[2]—assuming that there is no repulsive force such as a cosmological constant. Conversely, if the density of the universe is less than the critical density, the universe will continue to expand and the gravitational pull will not be enough to stop the universe from expanding. This scenario would result in the Big Freeze, where the universe cools as it expands and reaches a state of entropy.[4] One theory proposes that the universe could collapse to the state where it began and then initiate another Big Bang,[2] so in this way the universe would last forever, but would pass through phases of expansion (Big Bang) and contraction (Big Crunch).[5] Another scenario results in a flat universe which occurs when the critical density is just right. In this state the universe would always be slowing down, and eventually come to a stop in an interminable amount of time. Although, it is now understood that the critical density has been measured and determined to be a flat universe.[6]

Recent experimental evidence (namely the observation of distant supernovae as standard candles, and the well-resolved mapping of the cosmic microwave background) has led to speculation that the expansion of the universe is not being slowed down by gravity but rather accelerating. However, since the nature of the dark energy that is postulated to drive the acceleration is unknown, it is still possible (though not observationally supported as of today) that it might eventually reverse its developmental path and cause a collapse.[7] [8]

See also[edit]

References[edit]

  1. ^ Ellis, George F. R., R. Maartens, and M. A. H. MacCallum. Relativistic Cosmology. Cambridge: Cambridge UP, 2012. 146–47. Print.
  2. ^ a b c How the Universe Works 3. End of the Universe. Discovery Channel. 2014. 
  3. ^ a b Davies, Paul (January 9, 1997). The Last Three Minutes: Conjectures About The Ultimate Fate Of The Universe. Basic Books. ISBN 978-0-465-03851-0. 
  4. ^ Dr. Gary F. Hinshaw, WMAP Introduction to Cosmology. NASA (2008)
  5. ^ Jennifer Bergman, The Big Crunch, Windows to the Universe (2003)
  6. ^ Fraser Cain (2013-10-17), How Will The Universe End?, retrieved 2016-06-13 
  7. ^ Y Wang, J M Kratochvil, A Linde, and M Shmakova, Current Observational Constraints on Cosmic Doomsday. JCAP 0412 (2004) 006, astro-ph/0409264
  8. ^ McSween, Stephen A. "Dark Energy and the Red Shift in a Contracting Universe." [1]

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