How black hole Sgr-A* Was Found

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TL;DR Summary

Some astronomy history on the discovery of the black hole at the center of our galaxy.

https://www.astronomy.com/science/5...-beast-lurking-in-the-heart-of-the-milky-way/

The supermassive black hole in our Milky Way weighs about 4.3 million solar masses, equal to 1.4 trillion Earths

Finding the Milky Way in the night sky is fairly easy. A short stroll to a dark, isolated location affords a ready snapshot of its splendor, as a small fraction of its 100 billion to 400 billion stars blaze overhead like a sprawling celestial stream.

 

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More on Sagittarius A*

https://www.nasa.gov/image-article/supermassive-black-hole-sagittarius/