photon sphere
English
Etymology
From being a spherical region around a black hole, where photons travel in circular orbits, instead of hyperbolic ones.
Noun
photon sphere (plural photon spheres)
- (of a black hole) A region of around a black hole where photons travel in orbits around the singularity, just beyond the event horizon.
Synonyms
Coordinate terms
- accretion disc
- black hole
- black hole jet
- ergosphere
- event horizon
- Roche limit
- singularity
See also
- photosphere (a part of a star, that forms the visible disc/surface of the star)
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