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    • Spherical outer boundary

      • The event horizon is the spherical outer boundary of a black hole loosely considered to be its "surface." It is the point, according to NASA, that the gravitational influence of the black hole becomes so great that not even light is fast enough to escape it.
      www.space.com/black-holes-event-horizon-explained.html

      What is a black hole event horizon (and what happens there)?

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  3. www.space.com › black-holes-event-horizonWhat is a black hole event horizon (and what happens there)?

    Mar 3, 2023 · The event horizon is the spherical outer boundary of a black hole loosely considered to be its "surface." It is the point, according to NASA, that the gravitational...

  4. www.britannica.com › topic › event-horizon-black-holeEvent horizon | Definition, Explanation, & Facts | Britannica

    Sep 7, 2024 · Event horizon, boundary marking the limits of a black hole. At the event horizon, the escape velocity is equal to the speed of light. Since general relativity states that nothing can travel faster than the speed of light, nothing inside the event horizon can ever escape beyond it, including light.

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    • First Images of a Black Hole from the Event Horizon Telescope - AAS Nova
    • Event Horizon and Accretion Disk - Black Holes and Wormholes - The ...
    • What Comes After Photographing a Black Hole's Event Horizon? Could we ...
    • How to Escape a Black Hole: Understanding the Event Horizon, Photon ...

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  7. en.wikipedia.org › wiki › Event_horizonEvent horizon - Wikipedia

    Topologically, the event horizon is defined from the causal structure as the past null cone of future conformal timelike infinity. A black hole event horizon is teleological in nature, meaning that it is determined by future causes.

  8. science.nasa.gov › universe › black-holesBlack Hole Anatomy - Science@NASA

    The event horizon captures any light passing through it, and the distorted space-time around it causes light to be redirected through gravitational lensing. These two effects produce a dark zone that astronomers refer to as the event horizon shadow, which is roughly twice as big as the black hole’s actual surface.

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  10. skyandtelescope.org › whats-inside-a-black-holeWhat's Inside a Black Hole? Past the Event Horizon - Sky ...

    Dec 28, 2016 · The event horizon is where the escape speed exceeds the speed of light: you’d have to be going faster than light (which is impossible for any bit of matter) to escape the black hole’s gravity. Inside the event horizon is where physics goes crazy.

  11. www.nasa.gov › universe › what-are-black-holesWhat Are Black Holes? - NASA

    Sep 8, 2020 · A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole’s “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.

  12. imagine.gsfc.nasa.gov › objects › black_holes1Black Holes - Imagine the Universe!

    Sep 23, 2021 · There are two basic parts to a black hole: the singularity and the event horizon. The event horizon is the "point of no return" around the black hole. It is not a physical surface, but a sphere surrounding the black hole that marks where the escape velocity is equal to the speed of light.