During a supernova the 3-solar-mass core of a supergiant star collapses to form a black hole. What is the approximate diameter of the black hole's event horizon?

Question

Quizplus · Accepted Answer

The diameter of a black hole's event horizon, also known as the Schwarzschild radius, can be calculated using the formula $2GM/c^2$, where $G$ is the gravitational constant, $M$ is the mass of the black hole, and $c$ is the speed of light. For a 3-solar-mass black hole, this results in a diameter of approximately 18 kilometers, which is roughly the distance across a major city.

During a Supernova the 3-Solar-Mass Core of a Supergiant Star