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This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter. If you want to watch all the videos in the correct order, please visit my website at www.jasonkendall.com
Some of the best evidence we have for the existence of black holes comes from the one at the center of our Milky Way. The supermassive black hole at the center of the Milky Way, SGR A*, belies its presence through its influence on stars and gas clouds in its local environment. It's the nearest such black hole, and there is ample reason for us thinking it actually is such an object.
Supplement the videos with "OpenStax Astronomy"
openstax.org/books/astronomy/...
25 The Milky Way Galaxy