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Loading contentThe boundary around a black hole beyond which nothing, not even light, can escape.
The event horizon is not a physical surface but a point of no return: once matter or light crosses it, it cannot come back out. The Event Horizon Telescope imaged the shadow cast by this boundary around the black holes in M87 and the Milky Way.
Facts on this topic will be cited from these primary and reference sources.
Horizon-scale images of supermassive black holes (M87*, Sagittarius A*).
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.