21st century

===Physics===
* 2003 – [[Wilkinson Microwave Anisotropy Probe|WMAP]] observations of the [[cosmic microwave background]].
* 2010 – The [[Large Hadron Collider]]'s first high energy collisions took place in March 2010.
* 2012 – Physicists discover the [[Higgs boson]] based on collisions at the Large Hadron Collider, on 4 July. It is the latest particle to be discovered in the [[Standard Model]].<ref>{{cite news|url=https://www.bbc.co.uk/news/world-18702455|title=Higgs boson-like particle discovery claimed at LHC|work=BBC News|date=4 July 2012|access-date=6 October 2014|archive-date=16 November 2020|archive-url=https://web.archive.org/web/20201116171540/https://www.bbc.co.uk/news/world-18702455|url-status=live}}</ref>
* 2016 – On 11 February, [[LIGO]] announces the discovery of bursts of [[gravitational waves]] generated by cosmic collisions of [[black hole]]s on, and was previously predicted by [[Albert Einstein]] 100 years ago.
* 2022 – on 13 December, the [[United States Department of Energy|US Department of Energy]] announces that scientists at the [[National Ignition Facility]] have achieved the first positive [[Fusion energy gain factor|energy gain]] from a [[Fusion power|fusion reactor]] in history.<ref name="21st">{{cite web |title=The 21st Century and the 3rd Millennium |url=http://aa.usno.navy.mil/faq/docs/millennium.php |archive-url=https://web.archive.org/web/20191002112920/https://aa.usno.navy.mil/faq/docs/millennium.php |archive-date=2019-10-02 |access-date=2018-11-06 |website=aa.usno.navy.mil |language=en}}</ref>