photon sphere

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English[edit]

English Wikipedia has an article on:
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Etymology[edit]

From being a spherical region around a black hole, where photons travel in circular orbits, instead of hyperbolic ones.

Noun[edit]

photon sphere (plural photon spheres)

  1. (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[edit]

Coordinate terms[edit]

See also[edit]

  • photosphere (a part of a star, that forms the visible disc/surface of the star)