Editing Black hole (section)

=== Observation ===
[[File:Black hole optics.png|thumb|An infographic explaining in detail the appearance of a black hole.]]
On 11 February 2016, the [[LIGO Scientific Collaboration]] and the [[Virgo interferometer|Virgo collaboration]] [[first observation of gravitational waves|announced the first direct detection]] of [[gravitational wave]]s, representing the first observation of a black hole merger.<ref name="PRL-20160211" /> On 10 April 2019, the first direct image of a black hole and its vicinity was published, following observations made by the [[Event Horizon Telescope]] (EHT) in 2017 of the supermassive black hole in Messier 87's [[Galactic Center|galactic centre]].<ref name="APJL-20190410">{{cite journal|last1=Event Horizon Telescope|first1=The|author-link1=Event Horizon Telescope|date=2019|title=First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole|journal=[[The Astrophysical Journal]]|volume=875|page=L1|arxiv=1906.11238|bibcode=2019ApJ...875L...1E|doi=10.3847/2041-8213/ab0ec7|number=1|s2cid=145906806 |doi-access=free }}</ref><ref name="BoumanJohnson2016">{{cite book |last1=Bouman |first1=Katherine L. |title=2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR) |author-link1=Katie Bouman |last2=Johnson |first2=Michael D. |last3=Zoran |first3=Daniel |last4=Fish |first4=Vincent L. |last5=Doeleman |first5=Sheperd S. |last6=Freeman |first6=William T. |chapter=Computational Imaging for VLBI Image Reconstruction |year=2016 |pages=913–922 |doi=10.1109/CVPR.2016.105 |hdl=1721.1/103077 |arxiv=1512.01413|isbn=978-1-4673-8851-1|s2cid=9085016 }}</ref><ref name="NYT-20190412">{{cite news |last=Gardiner |first=Aidan |title=When a Black Hole Finally Reveals Itself, It Helps to Have Our Very Own Cosmic Reporter – Astronomers announced Wednesday that they had captured the first image of a black hole. The Times's Dennis Overbye answers readers' questions.|url=https://www.nytimes.com/2019/04/12/reader-center/black-holes-dennis-overbye.html |archive-url=https://ghostarchive.org/archive/20220101/https://www.nytimes.com/2019/04/12/reader-center/black-holes-dennis-overbye.html |archive-date=1 January 2022 |url-access=limited |date=12 April 2018 |work=[[The New York Times]] |access-date=15 April 2019}}{{cbignore}}</ref>  [[Gaia (spacecraft)|Gaia mission]] observations have found evidence of a Sun-like star orbiting a black hole named [[Gaia BH1]] around {{Convert|1,560|ly|pc|lk=on|abbr=off}} away;<ref name="El-Badry">{{Cite journal |last1=El-Badry |first1=Kareem |last2=Rix |first2=Hans-Walter |last3=Quataert |first3=Eliot |last4=Howard |first4=Andrew W. |last5=Isaacson |first5=Howard |last6=Fuller |first6=Jim |last7=Hawkins |first7=Keith |last8=Breivik |first8=Katelyn |last9=Wong |first9=Kaze W. K. |last10=Rodriguez |first10=Antonio C. |last11=Conroy |first11=Charlie |last12=Shahaf |first12=Sahar |last13=Mazeh |first13=Tsevi |last14=Arenou |first14=Frédéric |last15=Burdge |first15=Kevin B. |last16=Bashi |first16=Dolev |last17=Faigler |first17=Simchon |last18=Weisz |first18=Daniel R. |last19=Seeburger |first19=Rhys |last20=Monter |first20=Silvia Almada |last21=Wojno |first21=Jennifer |title=A Sun-like star orbiting a black hole  |journal=Monthly Notices of the Royal Astronomical Society |year=2023 |volume=518 |pages=1057–1085 |doi=10.1093/mnras/stac3140 |doi-access=free |arxiv=2209.06833 }}</ref> evidence suggests a [[brown dwarf star]] orbits [[Gaia BH2]].<ref>{{Cite journal |last1=Marchant |first1=Pablo |last2=Bodensteiner |first2=Julia |date=September 2024 |title=The Evolution of Massive Binary Stars |journal=Annual Review of Astronomy and Astrophysics |language=en |volume=62 |issue=1 |pages=21–61 |doi=10.1146/annurev-astro-052722-105936 |doi-access=free |issn=0066-4146|arxiv=2311.01865 |bibcode=2024ARA&A..62...21M }}</ref> Though only a couple dozen black holes have been found so far in the Milky Way, there are thought to be hundreds of millions, most of which are solitary and do not cause emission of radiation.<ref>{{cite web |title=ESO Instrument Finds Closest Black Hole to Earth |url=https://www.eso.org/public/news/eso2007/ |publisher=[[European Southern Observatory]] |date=6 May 2020 |access-date=2 April 2021 |archive-date=6 May 2020 |archive-url=https://web.archive.org/web/20200506232455/https://www.eso.org/public/news/eso2007/ |url-status=live }}</ref> Therefore, they would only be detectable by [[gravitational lens]]ing.