Thanks to brilliant.org/minutephysics/ for sponsoring this video! Check out their black hole course at brilliant.org/minutephysicsblackhole Support MinutePhysics on Patreon! www.patreon.com/minutephysics Link to Patreon Supporters: www.minutephysics.com/supporters/ This video is about the Schwarzschild radius of a black hole, (its "event horizon"), and how much mass and density is required to reach the point of no return where an object like a star, neutron star, red giant, etc will collapse into a black hole singularity. You can calculate it yourself using just the volume equation for a sphere, and the equation for the Schwarzschild radius (and knowing the speed of light and Newton's gravitational constant). REFERENCES Lecture notes on black holes: eagle.phys.utk.edu/guidry/astro616/lectures/lecture_ch18.pdf Mass of cat: www.google.com/search?q=mass+of+cat&oq=mass+of+cat Schwarzschild radius: en.wikipedia.org/wiki/Schwarzschild_radius LIGO Neutron Star Binary Merger: www.astronomy.com/news/2017/10/ligo-detects-a-neutron-star-merger Tolman-Oppenheimer-Volkoff Limit: en.wikipedia.org/wiki/Tolman%E2%80%93Oppenheimer%E2%80%93Volkoff_limit Neutron Star Equation of State & Density: chimera.roma1.infn.it/OMAR/dottorato/papers/annurev-nucl-102711-095018.pdf Neutron Star Radius: citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.928.903&rep=rep1&type=pdf MinutePhysics is on twitter - @minutephysics And facebook - facebook.com/minutephysics And Google+ (does anyone use this any more?) - bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich

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