There are 40 quintillion black holes in our Universe

Black holes are wondrous objects, but how many are out there? <img alt="" src="https://miro.medium.com/v2/resize:fit:700/0*WHZ3EpAi3tJbxG2I" style="height:404px; width:700px" /> Made famous by the movie Interstellar, this depiction of a black hole seen edge-on with respect to its accretion disk in a highly-curved spacetime shows the substantial spacetime-bending power of a black hole. Close to the event horizon but still outside of it, time passes at a tremendously different rate for an observer at that location than for an observer far away and outside of the main gravitational field. The number of black holes in the Universe, as well as the black hole mass function, is still under investigation. (<a href="https://www.nasa.gov/feature/goddard/2019/nasa-visualization-shows-a-black-hole-s-warped-world" rel="noopener ugc nofollow" target="_blank">Credit</a>: NASA’s Goddard Space Flight Center/Jeremy Schnittman) <a href="https://medium.com/starts-with-a-bang/there-are-40-quintillion-black-holes-in-our-universe-132cad53be01">Website</a>