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  2. Black hole - Wikipedia

    en.wikipedia.org/wiki/Black_hole

    A black hole is a region of spacetime where gravity is so strong that nothing, not even light and other electromagnetic waves, is capable of possessing enough energy to escape it. [2]

  3. What Are Black Holes? - NASA

    www.nasa.gov/universe/what-are-black-holes

    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.

  4. 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.

  5. Black holes are real, they're some of the strangest objects in space. Discover what black holes are and how they form with our informative black hole guide.

  6. Black Holes - NASA Science

    science.nasa.gov/universe/black-holes

    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.

  7. What Is a Black Hole? - National Geographic

    www.nationalgeographic.com/science/article/black-holes

    Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity.

  8. 10 Questions You Might Have About Black Holes - Science@NASA

    science.nasa.gov/universe/10-questions-you-might-have-about-black-holes

    A black hole is an extremely dense object in space from which no light can escape. While black holes are mysterious and exotic, they are also a key consequence of how gravity works: When a lot of mass gets compressed into a small enough space, the resulting object rips the very fabric of space and time, becoming what is called a singularity.

  9. Black Holes - HubbleSite

    hubblesite.org/contents/articles/black-holes

    What are Black Holes? A black hole is a region of space packed with so much matter that its own gravity prevents anything from escaping — even a ray of light. Although we can’t see a black hole, the material around it is visible. Material falling into a black hole forms a disk, similar to a whirlpool in a bathtub drain.

  10. Black Holes | Center for Astrophysics | Harvard & Smithsonian

    www.cfa.harvard.edu/research/topic/black-holes

    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”.

  11. What is a black hole? | University of Chicago News

    news.uchicago.edu/explainer/black-holes-explained

    Black holes are regions in space where an enormous amount of mass is packed into a tiny volume. This creates a gravitational pull so strong that not even light can escape. They are created when giant stars collapse, and perhaps by other methods that are still unknown.