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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/030507…
https://www.airspacemag.com/space/12_…
https://www.nrao.edu/whatisra/hist_ja…
https://arxiv.org/pdf/astro-ph/980721…
https://arxiv.org/pdf/1210.1294.pdf
https://www.nasa.gov/mission_pages/ch…
https://archive.briankoberlein.com/20…
http://blogs.discovermagazine.com/cru…
http://nautil.us/issue/69/patterns/ho…
https://www.pnas.org/content/107/16/7196
https://eventhorizontelescope.org/about
https://science.nasa.gov/astrophysics…
http://hubblesite.org/explore_astrono…
https://www.nasa.gov/vision/universe/…

Image Sources:
https://www.jpl.nasa.gov/news/news.ph…
https://www.istockphoto.com/photo/mil…
https://en.wikipedia.org/wiki/Green_B…
https://commons.wikimedia.org/wiki/Ca…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/w/index…
https://commons.wikimedia.org/wiki/Fi…