How We Discovered the Milky Way's Black Hole

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The search began with a physicist checking for sources of static on phone calls in the 1930s, but it took several decades to finally make one of the biggest discoveries in astronomy, Sagittarius A*.

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Sources:
https://arxiv.org/pdf/astro-ph/0305074.pdf
https://www.airspacemag.com/space/12_fm2017-mysteries-of-sagittarius-a-180961673/
https://www.nrao.edu/whatisra/hist_jansky.shtml
https://arxiv.org/pdf/astro-ph/9807210.pdf
https://arxiv.org/pdf/1210.1294.pdf
https://www.nasa.gov/mission_pages/chandra/multimedia/black-hole-SagittariusA.html
https://archive.briankoberlein.com/2015/10/14/how-does-interferometry-work/
http://blogs.discovermagazine.com/crux/2018/07/26/sagittarius-a-star/#.XP1jo9NKiRs
http://nautil.us/issue/69/patterns/how-supermassive-black-holes-were-discovered
https://www.pnas.org/content/107/16/7196
https://eventhorizontelescope.org/about
https://science.nasa.gov/astrophysics/focus-areas/black-holes
http://hubblesite.org/explore_astronomy/black_holes/encyc_mod1_observatories.html
https://www.nasa.gov/vision/universe/starsgalaxies/black_hole_description.html

Image Sources:
https://www.jpl.nasa.gov/news/news.php?feature=7372
https://www.istockphoto.com/photo/milky-way-night-sky-gm529681178-93312189
https://en.wikipedia.org/wiki/Green_Bank_Interferometer#/media/File:Howard_E._Tatel_Radio_Telescope_-_side.jpg
https://commons.wikimedia.org/wiki/Category:LIGO_(Livingston)#/media/File:Ligo-livingston-aerial-03_599x400.jpg
https://commons.wikimedia.org/wiki/File:Sagittarius_region_.jpg
https://commons.wikimedia.org/w/index.php?search=Karl+Jansky&title=Special:Search&profile=advanced&fulltext=1&advancedSearch-current=%7B%7D&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1&ns0=1#/media/File:Karl_Jansky.jpg
https://commons.wikimedia.org/wiki/File:Chandra_image_of_Sgr_A.jpg