tell me something about blackhole
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A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
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HERE IS UA ANSWER:
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
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A black hole is a region of space within which the force of gravity is so strong that nothing, not even light, can escape.
The basic structure of a black hole consists of a singularity hidden by an event horizon. Within the event horizon, the escape speed (vesc ) exceeds the speed of light ( c ) and an object is trapped forever. Outside the event horizon, vesc < c and the object is able to escape.
The existence of such objects was first suggested as far back as the late 1700s. However, it was Karl Schwarzschild (1873-1916), a German astronomer, who basically developed the modern idea for a black hole. Using Einstein’s theory of general relativity, Schwarzschild discovered that matter compressed to a point (now known as a singularity) would be enclosed by a spherical region of space from which nothing could escape. The limit of this region is called the event horizon, a name which signifies that it is impossible to observe any event taking place inside it (since information is unable to get out).
For a non-rotating black hole, the radius of the event horizon is known as theSchwarzschild radius, and marks the point at which the escape velocity from the black hole equals the speed of light. In theory, any mass can be compressed sufficiently to form a black hole. The only requirement is that its physical size is less than the Schwarzschild radius. For example, our Sun would become a black hole if its mass was contained within a sphere about 2.5 km across.
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The basic structure of a black hole consists of a singularity hidden by an event horizon. Within the event horizon, the escape speed (vesc ) exceeds the speed of light ( c ) and an object is trapped forever. Outside the event horizon, vesc < c and the object is able to escape.
The existence of such objects was first suggested as far back as the late 1700s. However, it was Karl Schwarzschild (1873-1916), a German astronomer, who basically developed the modern idea for a black hole. Using Einstein’s theory of general relativity, Schwarzschild discovered that matter compressed to a point (now known as a singularity) would be enclosed by a spherical region of space from which nothing could escape. The limit of this region is called the event horizon, a name which signifies that it is impossible to observe any event taking place inside it (since information is unable to get out).
For a non-rotating black hole, the radius of the event horizon is known as theSchwarzschild radius, and marks the point at which the escape velocity from the black hole equals the speed of light. In theory, any mass can be compressed sufficiently to form a black hole. The only requirement is that its physical size is less than the Schwarzschild radius. For example, our Sun would become a black hole if its mass was contained within a sphere about 2.5 km across.
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