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  • What Are Black Holes? - NASA
    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
  • Black hole - Wikipedia
    A black hole is a massive, compact astronomical object so dense that its gravity prevents anything from escaping, even light Albert Einstein 's theory of general relativity predicts that a sufficiently compact mass will form a black hole [4] The boundary of no escape is called the event horizon
  • Black Holes - NSF - 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 wandering star to a photon of light, gets captured
  • Black hole | Definition, Formation, Types, Pictures, Facts | Britannica
    Black hole, cosmic body of extremely intense gravity from which nothing, not even light, can escape It can be formed by the death of a massive star wherein its core gravitationally collapses inward upon itself, compressing to a point of zero volume and infinite density called the singularity
  • ESA - Black holes
    What are black holes? How do they form and evolve? What effect do they have on their surroundings and the rest of the Universe – and why should we care about them? ESA is working on answering these questions and many more using a suite of unique but complementary space missions
  • Black Holes - NASA Science
    Black holes are among the most mysterious cosmic objects, much studied but not fully understood These objects aren’t really holes They’re huge concentrations of matter packed into very tiny spaces A black hole is so dense that gravity just beneath its surface, the event horizon, is strong enough that nothing – not even light – can escape
  • What is a black hole? Black holes explained | Royal Observatory
    The short answer: A black hole is an area in space where gravity is so strong that light can not get out Explanation: If a ball is thrown upwards from the surface of the Earth it reaches a certain height and then falls back The harder it is thrown, the higher it goes
  • NASA SVS | Black Holes
    Supermassive black holes, with masses up to billions of times the Sun’s, can be found at the centers of most big galaxies Although a black hole does not emit light, matter falling toward it collects in a hot, glowing accretion disk that astronomers can detect
  • Black Holes | Center for Astrophysics | Harvard Smithsonian
    Black holes are some of the most fascinating and mind-bending objects in the cosmos The very thing that characterizes a black hole also makes it hard to study: its intense gravity All the mass in a black hole is concentrated in a tiny region, surrounded by a boundary called the “event horizon”
  • Black holes: Facts about the darkest objects in the universe
    Discover interesting facts about what black holes are, how they form and what would happen if you fell into one Black holes are places where gravity is so powerful that nothing — not even





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