Schwarzschild radius

Relativity

Definition: The radius a mass must be squeezed inside to become a black hole — 3 km for the Sun, 9 mm for the Earth.
Domain: Relativity

Open on the Glossary shelf — the interactive card, the filters, and everything alongside it.

From the Glossary database in Notion, last edited 2026-08-17. This page is the row, rendered by the build; nothing on it is written by hand.