A black hole is a region of spacetime where gravity is so strong that nothing—not even light—can escape once it crosses a boundary called the event horizon.

How Black Holes Form

Most black holes form when a massive star runs out of nuclear fuel and collapses under its own gravity...

Note: The point of no return is called the event horizon, not the black hole's "surface."

The Mathematics of Curved Spacetime

Einstein's field equations describe how mass curves spacetime:

[ \nabla \cdot \vec{E}=\frac{\rho}{\epsilon_0} ]

And the famous mass-energy relation: (E = mc^2)

Schwarzschild Radius

Every mass has a theoretical radius at which it would become a black hole...

Physics doesn't break at the event horizon—our equations do.

What Happens Inside?

Content continues here...