The Fermi paradox (or Fermi's paradox) is the apparent contradiction atween heich estimates o the probability o the existence o extraterrestrial ceevilisations, such as in the Drake equation, an the lack o evidence for such ceevilisations. The basic pynts o the argument, made bo pheesicists Enrico Fermi an Michael H. Hart, are:
- The Sun is a teepical star, an thare are billions o starns in the galaxy that are billions o years older.
- Wi heich probability, some o these starns will hae Yird-lik planets, an if the yird is teepical, some micht develop intelligent life.
- Some o these ceevilisations micht develop interstellar travel, a step the Yird is investigatin nou.
- Even at the slow pace o currently enveesioned interstellar travel, the Milky Way galaxy could be completely traversed in aboot a million years.
Accordin tae this line of thinkin, the Yird should already hae been veesitit bi extraterrestrial aliens thou Fermi saw no convincin evidence o this, nor ony signs o alien intelligence onywhaur in the observable universe, leadin him tae ask, "Whaur is everybody?"
References[eedit | eedit soorce]
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- Aguirre, V. Silva, G. R. Davies, S. Basu, J. Christensen-Dalsgaard, O. Creevey, T. S. Metcalfe, T. R. Bedding; et al. (2015). "Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology". Monthly Notices of the Royal Astronomical Society. 452 (2): 2127. arXiv:1504.07992. Bibcode:2015MNRAS.452.2127S. doi:10.1093/mnras/stv1388.CS1 maint: multiple names: authors leet (link) Accepted for publication in MNRAS. See Figure 15 in particular.
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- Hart, Michael H. (1975). "Explanation for the Absence of Extraterrestrials on Earth". Quarterly Journal of the Royal Astronomical Society. 16: 128–135. Bibcode:1975QJRAS..16..128H.
- Jones, E. M. (March 1, 1985). ""Where is everybody?" An account of Fermi's question"" (PDF). Los Alamos National Laboratory. OSTI 785733. Retrieved January 12, 2013.
- Overbye, Dennis (August 3, 2015). "The Flip Side of Optimism About Life on Other Planets". New York Times. Retrieved October 29, 2015.