When it comes to the black holes that populate the Universe, they range from the very tiny, of only ~3 solar masses or so and with event horizons that span only a few kilometers, all the way up to the incredibly supermassive, many billions of times as massive as our Sun, with event horizons on the scale of the entire Solar System. These black holes are fascinating not only for how they form and exist, but how they impact and shape the entire galaxies that they inhabit. At all different wavelengths, from X-ray to radio, as well as in gravitational waves, we're only starting to uncover the previously elusive science about these cosmic behemoths, and while we're all the richer for it today, it's fascinating to consider what questions we'll be answering decades down the line, too. Come have a listen to all of these topics and much, much more as we go on a fascinating journey concerning supermassive black holes with Dr. Adi Foord of Stanford, and expose the mysteries of the largest single structures in the entire Universe! (Image credit: NASA)