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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.
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 | Definition, Formation, Types, Pictures, & Facts | Britannica
What is a black hole? 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 their enormous gravitational fields on nearby matter.
Black holes — Everything you need to know | Space
Black holes are real — and they're some of the most mysterious objects in space. Discover what they are, how they form, and why they captivate scientists.
Black Holes - Harvard–Smithsonian Center for Astrophysics
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”.
What is a black hole? Scientists scramble to untangle cosmic mystery
What's at the center of a black hole? Scientists have a sobering answer. First, the good news: Black holes aren’t out to get us. But they do hold unfathomable mysteries.
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? | National Geographic
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.
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 holes: News, features, articles and facts | Live Science
Black holes are places where gravity is so powerful that nothing — not even light — can escape. Rather than being empty, black holes are chock full of matter that gets squeezed into a teensy...
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