Difference between revisions 8245758 and 8300524 on simplewiki

{{complex|date=March 2022}}
[[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]].]]

The ultimate fate of our universe may be the [[heat death of the universe]] or the [[big rip]]. Before that happens, it is possible to predict that the following will happen.

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The [[second law of thermodynamics]] is important to predictions about the future of Earth, of the Solar System, and the future of the expanding [[universe]]. The second law of thermodynamics says that [[entropy]] is always happening.  That means that the universe is slowly running out of the kind of energy that can do [[work (physics)|work]].<ref name="Nave"/> For example, stars will eventually run out of [[hydrogen]] fuel and burn out.<ref name="five ages"/>


==4th millennium==
The ''fouth millennium'' will be the millenium after the current millenium. It will begin on January 1, 3001 and will end on 3100.⏎
⏎
==<span id=Legend>Key</span>==

{| class="wikitable"
|-
| style="background: lavender;" | [[File:Five Pointed Star Solid.svg|16px|alt=Astronomy and astrophysics|Astronomy and astrophysics]]
| [[Astronomy]] and [[astrophysics]]
|-
| style="background: #f0dc82;" | [[File:Noun project 528.svg|16px|alt=Geology and planetary science|Geology and planetary science]]
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<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 |s2cid=118489638 }}</ref>
}}

{{Millennia}}

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