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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
The Big Crunch theory
The Big Crunch theory
Published: 2014/09/06
Channel: DJolyfun
Pickle ASMR Eating Sounds 馃憛  Big Crunch馃樆 Intense
Pickle ASMR Eating Sounds 馃憛 Big Crunch馃樆 Intense
Published: 2017/02/23
Channel: ASMRTheChew
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
Chime & Teminite - The Big Crunch
Chime & Teminite - The Big Crunch
Published: 2017/08/25
Channel: DubstepGutter
Pickle ASMR Eating Sounds/BIG Crunch/Intense
Pickle ASMR Eating Sounds/BIG Crunch/Intense
Published: 2017/04/27
Channel: ASMRTheChew
Asi Podria Ser El Fin Del Universo | Teoria Big Crunch | La Gran Implosi贸n | Gran Colapso
Asi Podria Ser El Fin Del Universo | Teoria Big Crunch | La Gran Implosi贸n | Gran Colapso
Published: 2017/04/15
Channel: 员袚员詫员薛爷押小訅薛袠椰薛
KFC BIG CRUNCH BOX MEAL | *No Talking ASMR | N.E Lets Eat
KFC BIG CRUNCH BOX MEAL | *No Talking ASMR | N.E Lets Eat
Published: 2018/01/26
Channel: N.E Lets Eat
Big Bang & Big Crunch
Big Bang & Big Crunch
Published: 2009/02/03
Channel: Kurdistan Planetarium
Contraction of Universe or Big Crunch
Contraction of Universe or Big Crunch
Published: 2009/02/03
Channel: Kurdistan Planetarium
Pickle ASMR Eating Sounds BIG Crunch Intense (Reaction)
Pickle ASMR Eating Sounds BIG Crunch Intense (Reaction)
Published: 2017/08/16
Channel: The Life Of Mac
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
La Fin de l
La Fin de l'Univers | Le Big Crunch | Documentaire
Published: 2016/06/29
Channel: Juste Pour Info
What About the Big Crunch?
What About the Big Crunch?
Published: 2017/12/18
Channel: Frank Turek
Alpha.Centauri.-.175.-.Was.ist.der.Big.Crunch
Alpha.Centauri.-.175.-.Was.ist.der.Big.Crunch
Published: 2013/03/04
Channel: TheLordOfDeath1000
The Big Crunch Theory
The Big Crunch Theory
Published: 2016/04/12
Channel: infindo 鈭
O Big Crunch
O Big Crunch
Published: 2007/11/16
Channel: Matheus Campos
24.- Big Bang , Big crunch - El Universo
24.- Big Bang , Big crunch - El Universo
Published: 2007/07/24
Channel: lexandro777
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
Big Chill ou Big Crunch
Big Chill ou Big Crunch
Published: 2011/02/16
Channel: Dubigbangauvivant
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
Big Bang and Big Crunch Theory In Absence Of Quran Explained | Hindi / Urdu
Big Bang and Big Crunch Theory In Absence Of Quran Explained | Hindi / Urdu
Published: 2017/09/30
Channel: HASI TV
Big Crunch theory science project
Big Crunch theory science project
Published: 2015/12/08
Channel: Isabella Pasco
(In Hindi) 啶灌ぎ啶距ぐ啷 啶啶班す啷嵿ぎ啶距啶 啶曕ぞ 啶呧啶 啶曕啶膏 啶灌啶椸ぞ ? | Big Rip, Big Crunch, Big Freeze, Big Slurp.
(In Hindi) 啶灌ぎ啶距ぐ啷 啶啶班す啷嵿ぎ啶距啶 啶曕ぞ 啶呧啶 啶曕啶膏 啶灌啶椸ぞ ? | Big Rip, Big Crunch, Big Freeze, Big Slurp.
Published: 2017/02/16
Channel: Planet Aakash
Documentaire Du Big Bang au Big Crunch (French)
Documentaire Du Big Bang au Big Crunch (French)
Published: 2012/08/04
Channel: Happy2bmuslim93
L
L'UNIVERSO STA MORENDO - BIG RIP - BIG FREEZE - BIG CRUNCH
Published: 2015/08/12
Channel: [OBY] Divulgazione Scientifica
NACHO CHEESE MUKBANG ASMR Eating Sounds/BIG CRUNCH | STORY TIME
NACHO CHEESE MUKBANG ASMR Eating Sounds/BIG CRUNCH | STORY TIME
Published: 2017/09/20
Channel: ASMRTheChew
KFC Big Crunch Taste Test | KBDProductionsTV
KFC Big Crunch Taste Test | KBDProductionsTV
Published: 2012/02/06
Channel: KBDProductionsTV
Funkness - BIG CRUNCH
Funkness - BIG CRUNCH
Published: 2013/08/10
Channel: NewRetroClub
El fin del universo, Big Crunch
El fin del universo, Big Crunch
Published: 2017/05/05
Channel: Astro Guy
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
Will the Big Bang Go Backwards?
Will the Big Bang Go Backwards?
Published: 2015/09/08
Channel: Fraser Cain
Quatro Cen谩rios Para o Fim do Universo - Space Today TV Ep.279
Quatro Cen谩rios Para o Fim do Universo - Space Today TV Ep.279
Published: 2016/06/10
Channel: SpaceToday
The Big Crunch and Big Bounce theories.
The Big Crunch and Big Bounce theories.
Published: 2017/04/07
Channel: The 4t Channel
Cracker 5   The Big Crunch
Cracker 5 The Big Crunch
Published: 2016/01/22
Channel: Dahlia Una
Chime & Teminite - The Big Crunch
Chime & Teminite - The Big Crunch
Published: 2017/09/15
Channel: Teminite
Du Big Bang au Big Crunch
Du Big Bang au Big Crunch
Published: 2010/06/11
Channel: BuddyBelgium
La teor铆a del Big Crunch (Gran implosi贸n)
La teor铆a del Big Crunch (Gran implosi贸n)
Published: 2013/12/08
Channel: Jose525full
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
UFC Golden Fiesta Big Crunch TVC 2015 - Crack 30s
UFC Golden Fiesta Big Crunch TVC 2015 - Crack 30s
Published: 2016/07/24
Channel: Timmy Turner & Chloe Carmichael
The BIG Crunch - CTK Promotional Video
The BIG Crunch - CTK Promotional Video
Published: 2017/03/07
Channel: Robert Cannone
People Try The New Oreo Big Crunch Bar
People Try The New Oreo Big Crunch Bar
Published: 2016/11/26
Channel: BuzzFeedVideo
MAQUETAS  DEL BIG CRUNCH - GRAN COLAPSO DEL UNIVERSO
MAQUETAS DEL BIG CRUNCH - GRAN COLAPSO DEL UNIVERSO
Published: 2017/03/09
Channel: MAQUETAS PERU
Funniest 911 Call Ever 2 - Big Crunch
Funniest 911 Call Ever 2 - Big Crunch
Published: 2012/06/28
Channel: Hunter Collins
The Big Crunch Theory - Distortion (DJ Koze Remix)
The Big Crunch Theory - Distortion (DJ Koze Remix)
Published: 2010/03/16
Channel: Versatile Records
B陌G CRUNCH (B脺Y脺K 脟脰K脺艦) Evrenin Sonu!
B陌G CRUNCH (B脺Y脺K 脟脰K脺艦) Evrenin Sonu!
Published: 2014/12/21
Channel: Mert iven
Al salir me esperas. Cap铆tulo 01x10: Big Crunch
Al salir me esperas. Cap铆tulo 01x10: Big Crunch
Published: 2016/06/28
Channel: Al salir me esperas
KFC - Big Crunch Sandwich (????, Canada)
KFC - Big Crunch Sandwich (????, Canada)
Published: 2012/01/14
Channel: The Hall of Advertising
Der Kosmos - Big Bang, Big Crunch
Der Kosmos - Big Bang, Big Crunch
Published: 2015/11/24
Channel: Sendeschluss TV
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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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.

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.[1] Eventually all matter would collapse into black holes, which would then coalesce, producing a unified black hole or Big Crunch singularity.

The idea behind the theory is that the expansion of the universe was linked to the energy generated by Big Bang, thus the speed of the matter would decrease as matter traveled away from the explosion point, simply by the attraction or gravity, of other celestial bodies traveling along. This would act as ballast and would eventually lead to a halt of the expansion. Then as bodies attract and there is no matter beyond the maximum expansion point the matter would reverse the path, traveling back to the original explosion site.

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 occur in opposite order.[2] 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 heterogeneous gas, whose atoms would break down into their constituent subatomic particles because of the increasing temperature, that would be absorbed by the already coalescing black holes before the Big Crunch itself.[2]

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[1]鈥攁ssuming 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.[3][not in citation given] One theory proposes that the universe could collapse to the state where it began and then initiate another Big Bang,[1] so in this way the universe would last forever, but would pass through phases of expansion (Big Bang) and contraction (Big Crunch).[4] 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.[5]

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.[6][7]

See also[edit]

References[edit]

  1. ^ a b c How the Universe Works 3. End of the Universe. Discovery Channel. 2014. 
  2. ^ 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. 
  3. ^ Dr. Gary F. Hinshaw, WMAP Introduction to Cosmology. NASA (2008)
  4. ^ Jennifer Bergman, The Big Crunch, Windows to the Universe (2003)
  5. ^ Fraser Cain (2013-10-17), How Will The Universe End?, retrieved 2016-06-13 
  6. ^ Y Wang, J M Kratochvil, A Linde, and M Shmakova, Current Observational Constraints on Cosmic Doomsday. JCAP 0412 (2004) 006, astro-ph/0409264
  7. ^ McSween, Stephen A. "Dark Energy and the Red Shift in a Contracting Universe." [1]

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