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{{short description|Scientific projections regarding the far future}}
[[File:Red Giant Earth warm.jpg|thumb|274x274px|alt= A dark gray and red sphere representing the Earth lies against a black background to the right of an orange circular object representing the Sun| Artist's idea of the [[Earth]] several billion years from now, when the [[Sun]] is a [[red giant]].]]

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| style="background: #CEFF00;" | [[File:Butterfly icon (Noun Project).svg|16px|alt= Biology|Biology]]
| 10 million
| Estimated time for full recovery of [[biodiversity]] after a potential [[Holocene extinction]], if it were as large as the five previous [[extinction event|major extinction events]].<ref>{{cite journal|last1= Kirchner|first1= James W.|last2= Weil|authorlink1= James Kirchner|first2= Anne|title= Delayed biological recovery from extinctions throughout the fossil record|
url= https://archive.org/details/sim_nature-uk_2000-03-09_404_6774/page/177|journal= Nature|date= 9 March 2000|volume= 404|pages= 177–180 |bibcode = 2000Natur.404..177K|doi= 10.1038/35004564|issue= 6774|pmid= 10724168}}</ref>

(contracted; show full)mated time for an [[Astronomical engineering|astroengineering]] project that could alter the [[Earth's orbit]], so that the Earth's climate would stay the same even though the Sun will become brighter.  People could do this by using asteroids with enough [[gravity assist|gravity]] to pull on the Earth.<ref>{{cite journal | first=D. G. | last=Korycansky |author2=Laughlin, Gregory|author3= Adams, Fred C. | date=2001 |
title=Astronomical engineering: a strategy for modifying planetary orbits |
 url=https://archive.org/details/sim_astrophysics-and-space-science_2001-03_275_4/page/349 | doi=10.1023/A:1002790227314 | journal=Astrophysics and Space Science | id=Astrophys.Space Sci.275:349-366,2001 | volume=275 | issue=4 | pages=349–366 | hdl=2027.42/41972 | bibcode=2001Ap&SS.275..349K | arxiv=astro-ph/0102126 }}</ref><ref>{{cite journal|last=Korycansky|first=D. G.|title=Astroengineering, or how to save the Earth in only one billion years|journal=Revista Mexicana de Astronomía y Astrofísica|date=2004|volume=22|pages=117–120|url=http://www.astroscu.unam.mx/rmaa/RMxAC..22/PDF/R(contracted; show full)<ref name=loeb_2016>{{cite journal |last1=Loeb |first1=Abraham |year=2016 |last2=Batista |first2=Rafael |last3=Sloan |first3=W. |title=Relative Likelihood for Life as a Function of Cosmic Time |journal=Journal of Cosmology and Astroparticle Physics |volume=2016 |issue=8 |pages=040 | arxiv = 1606.08448 |doi=10.1088/1475-7516/2016/08/040|bibcode=2016JCAP...08..040L }}</ref>
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{{Millennia}}

[[Category:Time]]
[[Category:Science]]