Editing Extremophile (section)

===Overview===
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! colspan="4"| Limits of known life on Earth<ref name="Marion2004">{{Cite journal |last1=Marion |first1=Giles M. |last2=Fritsen |first2=Christian H. |last3=Eicken |first3=Hajo |last4=Payne |first4=Meredith C. |date=December 2003 |title=The Search for Life on Europa: Limiting Environmental Factors, Potential Habitats, and Earth Analogues |journal=Astrobiology |volume=3 |issue=4 |pages=785–811 |bibcode=2003AsBio...3..785M |doi=10.1089/153110703322736105 |pmid=14987483}}</ref>
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! Factor !! Environment / source !! Limits !! Examples
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| High temperature || [[Hydrothermal vent|Submarine hydrothermal vents]], [[oceanic crust]]|| {{convert|110|°C}} to {{convert|122|°C}}<ref name=":0" /><ref name="Marion2004" /> || ''[[Pyrolobus fumarii]]'', ''[[Pyrococcus furiosus]]'', [[Thermophile|other species]]
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| Low temperature || Ice || {{convert|-20|°C}} to {{convert|-25|°C}}<ref name="NeufeldClarke20132">{{Cite journal |last1=Neufeld |first1=Josh |last2=Clarke |first2=Andrew |last3=Morris |first3=G. John |last4=Fonseca |first4=Fernanda |last5=Murray |first5=Benjamin J. |last6=Acton |first6=Elizabeth |last7=Price |first7=Hannah C. |year=2013 |title=A Low Temperature Limit for Life on Earth |journal=PLOS ONE |volume=8 |issue=6 |page=e66207 |bibcode=2013PLoSO...866207C |doi=10.1371/journal.pone.0066207 |pmc=3686811 |pmid=23840425 |doi-access=free}}</ref> || ''[[Rhodotorula glutinis]]'', [[Psychrophile|other species]]
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| [[Alkalinity|Alkaline]] systems || [[Soda lake]]s || [[pH]] > 11<ref name="Marion2004" /> || ''[[Psychrobacter]]'', ''[[Vibrio]]'', ''[[Arthrobacter]]'', ''[[Natronobacterium]], [[Alkaliphile|other species]]''
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| [[Acid]]ic systems || Volcanic springs, [[acid mine drainage]] || pH 0.06 to 1.0<ref name="Marion2004" /> ||  ''[[Picrophilus]]'', [[Acidophile|other species]]
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| [[Ionizing radiation]] || [[Cosmic ray]]s, [[X-ray]]s, [[radioactive decay]] || 1,500 to 6,000 [[Gray (unit)|Gy]]<ref name="Marion2004" />
| rowspan="2" | ''[[Deinococcus radiodurans]]'', ''[[Rubrobacter]]'', ''[[Thermococcus gammatolerans]]''
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| [[UV radiation]] || Sunlight || 5,000 [[Joule|J]]/m<sup>2</sup><ref name="Marion2004" />

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| High pressure || [[Mariana Trench]] || 1,100 [[Bar (unit)|bar]]<ref name="Marion2004" /> || ''[[Pyrococcus]]'' sp., [[Piezophile|other species]]
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| Salinity || High salt concentration || [[Water activity|a<sub>w</sub>]] ~ 0.6<ref name="Marion2004" /> ||  ''[[Halobacteriaceae]]'', ''[[Dunaliella salina]]'', [[Halophile|other species]]
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| [[Desiccation]] || [[Atacama Desert]] (Chile), [[McMurdo Dry Valleys]] (Antarctica) || ~60% relative humidity<ref name="Marion2004" /> || ''[[Chroococcidiopsis]], [[Xerophile|other species]]''
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| Deep crust || Accessed in some gold mines ||  ||  ''[[Desulforudis audaxviator]]'', ''[[Halicephalobus mephisto]]'', ''[[Mylonchulus brachyurus]]'', unidentified arthropods
|}