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**Shared November 30, 2017**

Thanks to https://brilliant.org/minutephysics/ for sponsoring this video! Check out their black hole course at https://brilliant.org/minutephysicsbl...

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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).

REFERENCES

Lecture notes on black holes: http://eagle.phys.utk.edu/guidry/astr...

Mass of cat: https://www.google.com/search?q=mass+...

Schwarzschild radius: https://en.wikipedia.org/wiki/Schwarz...

LIGO Neutron Star Binary Merger: http://www.astronomy.com/news/2017/10...

Tolman-Oppenheimer-Volkoff Limit: https://en.wikipedia.org/wiki/Tolman%...

Neutron Star Equation of State & Density: http://chimera.roma1.infn.it/OMAR/dot...

Neutron Star Radius: http://citeseerx.ist.psu.edu/viewdoc/...

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

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