In general relativity: A closed surface that is the boundary of a black hole. Whatever enters through this boundary from the outside can never again leave the inside.
Synonym: event horizon.
What is Einstein Online?
Einstein Online is a web portal with comprehensible information on Einstein's theories of relativity and their most exciting applications from the smallest particles to cosmology.
Einstein Online is provided by the
Max Planck Institute for Gravitational Physics(Albert-Einstein-Institut)
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More than 400 entries from "absolute zero" to "XMM Newton" - whenever you see this type of link on an Einstein Online page, it'll take you to an entry in our relativistic dictionary.
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Our recommendations for books and websites on relativity and its history.
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