Thanks to https://brilliant.org/minutephysics/ for sponsoring this video! Check out their black hole course at <a href="https://brilliant.org/minutephysicsblackhole" target="_blank" rel=”nofollow”>https://brilliant.org/minutephysicsblackhole

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).