Not even light can escape a black hole's gravitational pull, so how do we actually know they exist? And what's the deal with the supermassive black hole at the center of the Milky Way?Read the transcript.Check out all the Quick and Dirty Tips shows.Subscribe to the newsletter for regular updates.Join the conversation on Facebook and Twitter.Links:https://www.quickanddirtytips.com/education/science/supermassive-black-holehttps://www.quickanddirtytips.com/podcastshttps://www.quickanddirtytips.com/subscribehttps://www.facebook.com/qdteinsteinhttps://twitter.com/qdteinstein