Orbital mechanics · r_s = 2GM / c²
Schwarzschild Radius
The radius of the event horizon of a non-rotating black hole of a given mass — the size to which that mass must be compressed to become one. The Sun's is just under three kilometres.
Event-horizon radius2.954km
Formula: r_s = 2GM / c²
Worked example
With the default inputs, schwarzschild radius evaluates to 2.954 km — 1 M☉ → 2.95 km. The validator recomputes this against the known value on every build, so the formula is checked, not asserted.
Highlights
- ›Sun's mass: 2.95 km
The physics behind it
Knowledge connections
- Associated withBlack Hole
Sources
The primary and reference sources this topic draws on.
- NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.