what is mean by singularity in astronomy?

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singularity in astronamy is a black hole; a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, into which objects can fall, but out of which nothing can come. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect blackbody in thermodynamics. which is also a bend in all time and space, it has never really been proven but black holes could b portals to other dimentions or other things beyond what our minds can imagine, whole other universese or diffrent times and places of existance
 
A black hole is a singularity with the mass of a star plus all of its associated effects out to a range that a star normally has. The black hole includes the event horizon, the photon sphere, the ergosphere and usually an accretion disk.

The singularity is at the center of a black hole and has no dimensions; it is a point.
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If you thought of space and time as a fabric a singularity would be a rip in that fabric. The rip would be caused by the presence of a black hole, hence a singularity marks the existance of a black hole. A rip in space - time means a region in existance that does not have space ( spatial dimension) and does not experience the passage of time (frozen in time).

From my understanding since the black hole is the only thing that can create this a ripped state it can be said that a sigularity is a black hole.
Hopefully, I have the conept right.
 
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