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  1. Black hole - Wikipedia

    [3] A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein 's theory of general relativity predicts that a sufficiently compact mass …

  2. What 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 …

  3. Black hole | Definition, Formation, Types, Pictures, & Facts ...

    2 days ago · A black hole is a cosmic body of extremely intense gravity from which even light cannot escape. Black holes usually cannot be observed directly, but they can be “observed” by the effects of …

  4. Black Hole - Definition, Formation, Types, and Mysteries

    Sep 20, 2025 · Explore what a black hole is, how one forms, their types, structure, history, and the latest discoveries about these cosmic enigmas.

  5. Black Holes - Harvard–Smithsonian Center for Astrophysics

    As gas flows around a black hole, it heats up, paradoxically making these invisible objects into some of the brightest things in the entire universe. As a result, we can see some black holes from billions of …

  6. Black holes — Everything you need to know | Space

    May 6, 2022 · Black holes are some of the strangest and most fascinating objects in the universe. They're extremely dense, with gravitational forces so strong, that nothing, not even lights, can …

  7. Black Holes | NSF - U.S. National Science Foundation

    Black holes are extremely dense pockets of matter, objects of such incredible mass and miniscule volume that they drastically warp the fabric of space-time. Anything that passes too close, from a …