Concept
Photon Sphere
Where light itself can orbit a black hole.
A spherical region around a non-rotating black hole at 1.5 Schwarzschild radii where photons can move in circular orbits.
Overview
A spherical region around a non-rotating black hole at 1.5 Schwarzschild radii where photons can move in circular orbits.
See also
Black Holes
Regions where gravity stops light itself.
Lagrange Points
Five spots where gravity and orbital motion balance.
Event Horizon
The point of no return around a black hole.
Singularity
A point of infinite density inside a black hole.
Exoplanets
Worlds orbiting other stars.
The Habitable Zone
Where liquid water can exist on a planet's surface.