For the idea that Earth has been affected in the past by short-lived, violent worldwide events, see Catastrophism.
Neocatastrophism is the hypothesis that life-exterminating events such as gamma-ray bursts have acted as a galactic regulation mechanism in the Milky Way upon the emergence of complex life in its habitable zone.[1][2][3] It is one of several proposed solutions to the Fermi paradox since it provides a mechanism which would have delayed the advent of intelligent beings in local galaxies near Earth.
Gamma-ray bursts might have regulated the advent of intelligent life
It is estimated that Earth-like planets in the Milky Way started forming 9 billion years ago, and that their median age is 6.4 ± 0.7 Ga.[4] Moreover, 75% of stars in the galactic habitable zone are older than the Sun.[5] This makes the existence of potential planets with evolved intelligent life more likely than not to be older than that of the Earth (4.54 Ga). This creates an observational dilemma since even slower-than-lightspeed interstellar travel could in theory take only 5 to 50 million years to colonize the galaxy.[6] This leads to a conundrum first posed in 1950 by the physicist Enrico Fermi in his namesake paradox: "Why are no aliens or their artifacts physically here?"[7]
The neocatastrophism resolutionedit
The hypothesis posits that astrobiological evolution is subject to regulation mechanisms that arrest or postpone the advent of complex creatures capable of interstellar communication and traveling technology. These regulation mechanisms act to temporarily sterilize planets of biology in the galactic habitable zone. The main proposed regulation mechanism is gamma-ray bursts.[1][2][3]
Part of the neocatastrophism hypothesis is that stellar evolution produces a decreasing frequency of such catastrophic events increasing the length of the "window" in which intelligent life might arise as galaxies age. According to modeling,[1][2][3] this creates the possibility of a phase transition at which point a galaxy turns from a place that is essentially dead (with a few pockets of simple life) to one that is crowded with complex life forms.
^ abcCirković MM, Vukotić B. (2008). Astrobiological phase transition: towards resolution of Fermi's paradox. Orig Life Evol Biosph. 38(6):535-47. doi:10.1007/s11084-008-9149-y PMID 18855114
^ abcĆirković M.M. (2009). Fermi's paradox: The last challenge for copernicanism? Serbian Astronomical Journal 178:1-20 doi:10.2298/SAJ0978001C
^ abcCirkovic, M. M. Vukotic, B. (2009). Astrobiological Landscape and Neocatastrophism.[permanent dead link] Publications of the Astronomical Observatory of Belgrade,86:193-19
^Lineweaver C.H. (2001). An Estimate of the Age Distribution of Terrestrial Planets in the Universe: Quantifying Metallicity as a Selection Effect. Icarus, 151:307-313 doi:10.1006/icar.2001.6607.
^Lineweaver CH, Fenner Y, Gibson BK. (2004). The galactic habitable zone and the age distribution of complex life in the Milky Way. Science. 303(5654):59-62. doi:10.1126/science.1092322 PMID 14704421
^Crawford, I.A., "Where are They? Maybe we are alone in the galaxy after all" 2009-03-26 at the Wayback Machine, Scientific American, July 2000, 38-43, (2000)
^Webb S. (2002). If the universe is teeming with aliens, where is everybody? Fifty solutions to the Fermi paradox and the problem of extraterrestrial life. Copernicus Books (Springer Verlag)
January 01, 1970
neocatastrophism, idea, that, earth, been, affected, past, short, lived, violent, worldwide, events, catastrophism, hypothesis, that, life, exterminating, events, such, gamma, bursts, have, acted, galactic, regulation, mechanism, milky, upon, emergence, comple. For the idea that Earth has been affected in the past by short lived violent worldwide events see Catastrophism Neocatastrophism is the hypothesis that life exterminating events such as gamma ray bursts have acted as a galactic regulation mechanism in the Milky Way upon the emergence of complex life in its habitable zone 1 2 3 It is one of several proposed solutions to the Fermi paradox since it provides a mechanism which would have delayed the advent of intelligent beings in local galaxies near Earth Gamma ray bursts might have regulated the advent of intelligent life Contents 1 The problem 2 The neocatastrophism resolution 3 See also 4 ReferencesThe problem editIt is estimated that Earth like planets in the Milky Way started forming 9 billion years ago and that their median age is 6 4 0 7 Ga 4 Moreover 75 of stars in the galactic habitable zone are older than the Sun 5 This makes the existence of potential planets with evolved intelligent life more likely than not to be older than that of the Earth 4 54 Ga This creates an observational dilemma since even slower than lightspeed interstellar travel could in theory take only 5 to 50 million years to colonize the galaxy 6 This leads to a conundrum first posed in 1950 by the physicist Enrico Fermi in his namesake paradox Why are no aliens or their artifacts physically here 7 The neocatastrophism resolution editThe hypothesis posits that astrobiological evolution is subject to regulation mechanisms that arrest or postpone the advent of complex creatures capable of interstellar communication and traveling technology These regulation mechanisms act to temporarily sterilize planets of biology in the galactic habitable zone The main proposed regulation mechanism is gamma ray bursts 1 2 3 Part of the neocatastrophism hypothesis is that stellar evolution produces a decreasing frequency of such catastrophic events increasing the length of the window in which intelligent life might arise as galaxies age According to modeling 1 2 3 this creates the possibility of a phase transition at which point a galaxy turns from a place that is essentially dead with a few pockets of simple life to one that is crowded with complex life forms See also edit nbsp Astronomy portal nbsp Biology portal Anthropic principle Drake equation Goldilocks Principle Great Filter Mediocrity principle Planetary habitability Rare Earth hypothesisReferences edit a b c Cirkovic MM Vukotic B 2008 Astrobiological phase transition towards resolution of Fermi s paradox Orig Life Evol Biosph 38 6 535 47 doi 10 1007 s11084 008 9149 y PMID 18855114 a b c Cirkovic M M 2009 Fermi s paradox The last challenge for copernicanism Serbian Astronomical Journal 178 1 20 doi 10 2298 SAJ0978001C a b c Cirkovic M M Vukotic B 2009 Astrobiological Landscape and Neocatastrophism permanent dead link Publications of the Astronomical Observatory of Belgrade 86 193 19 Lineweaver C H 2001 An Estimate of the Age Distribution of Terrestrial Planets in the Universe Quantifying Metallicity as a Selection Effect Icarus 151 307 313 doi 10 1006 icar 2001 6607 Lineweaver CH Fenner Y Gibson BK 2004 The galactic habitable zone and the age distribution of complex life in the Milky Way Science 303 5654 59 62 doi 10 1126 science 1092322 PMID 14704421 Crawford I A Where are They Maybe we are alone in the galaxy after all Archived 2009 03 26 at the Wayback Machine Scientific American July 2000 38 43 2000 Webb S 2002 If the universe is teeming with aliens where is everybody Fifty solutions to the Fermi paradox and the problem of extraterrestrial life Copernicus Books Springer Verlag Retrieved from https en wikipedia org w index php title Neocatastrophism amp oldid 1222193004, wikipedia, wiki, book, books, library,
