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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).
Lecture notes on black holes: http://eagle.phys.utk.edu/guidry/astro616/lectures/lecture_ch18.pdf
Schwarzschild radius: https://en.wikipedia.org/wiki/Schwarzschild_radius
LIGO Neutron Star Binary Merger: http://www.astronomy.com/news/2017/10/ligo-detects-a-neutron-star-merger
Tolman-Oppenheimer-Volkoff Limit: https://en.wikipedia.org/wiki/Tolman%E2%80%93Oppenheimer%E2%80%93Volkoff_limit
Neutron Star Equation of State & Density: http://chimera.roma1.infn.it/OMAR/dottorato/papers/annurev-nucl-102711-095018.pdf
Neutron Star Radius: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.928.903&rep=rep1&type=pdf
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Created by Henry Reich