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Either nothing or just unknown. Dark matter is a term used by scientists to describe the apparent missing mass of the universe. It is either made up of matter that we can't detect or an error in calculation due to a fundamental error in our current understanding of the nature of the universe. (I suspect the latter).
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What is being expelled from black holes?
While nothing can escape from within the event horizon of a black hole, matter that has not yet passed that point of no return still has a chance. When a large amount of matter falls into a black hole, there is not enough room for all of it to reach the event horizon. What doesn't fall into the event horizon gets ejected in two jets of subatomic particles traveling at almost the speed of light.
What is the name for the boundary around a black hole beyond which events cannot affect the observer?
The "boundary" you're probably thinking of is called the event horizon. Past this point, the escape velocity of the black hole exceeds the speed of light, meaning nothing, including light, can escape it.
What is the difference between the inner event horizon and outer event horizon?
the event horizon is an imaginary spherical or ellipsoidal shell at a certain altitude above the singularity of the black hole, the shape and altitude above the singularity of this imaginary shell depends on only three properties of the singularity: mass, spin, and charge. the event horizon shell is not solid and so things fall through it quite easily, but nothing inside it can go outside it including lighta black hole has no surface, only a singularity of infinite density at its center
Why the event horizon of a black hole stop the light from getting rid of that?
At the point of the event horizon, the pull of gravity is so strong that the escape velocity reaches the speed of light. As such, when light reaches this point, it cannot escape.
How does the event horizon affect space?
This is a pretty vague question, but an event horizon is essentially the "point of no return" in a black hole. It is where the fabric of space-time is beginning to bend and soon rip.
Is the Event Horizon the surface of singularity?
No, the Event Horizon is outside the singularity.The singularity probably has no surface as it is an infinitesimal point.
Can an evanescent wave bounce off the event horizon of a black hole and convey what's inside?
The event horizon is not a surface you can touch, or from which things can "bounce off". It is simply the point of no return - if anything gets inside the event horizon, then it can't get out anymore, no matter in what direction it moves, and even if it moves at the speed of light.
What is the event horizon in a black hole?
That is the "point of no return". Within the event horizon, gravity is so strong that anything that crosses the event horizon can't get out, even if it moves at the speed of light.
What is the name for the boundary around a black hole beyond which events cannot affect the observer?
The "boundary" you're probably thinking of is called the event horizon. Past this point, the escape velocity of the black hole exceeds the speed of light, meaning nothing, including light, can escape it.
What is being expelled from black holes?
While nothing can escape from within the event horizon of a black hole, matter that has not yet passed that point of no return still has a chance. When a large amount of matter falls into a black hole, there is not enough room for all of it to reach the event horizon. What doesn't fall into the event horizon gets ejected in two jets of subatomic particles traveling at almost the speed of light.
How do black holes eject matter if they are so massive nothing can escape their gravitational pull?
As matter nears and crosses the event horizon, it is violently torn apart. This causes the release of huge amounts of radiation and particles from just outside of the event horizon. This is one reason why the swallowing of a star by a large black hole is so catastrophic; unimaginable amounts of radiation and particles are released.Note that the matter is ejected outside the black hole - to be more precise, outside the event horizon, which is the "point of no return".
Does a black hole have an horizon?
The so-called "event horizon" of a black hole is the point-of-no-return. That means that anything that gets inside the event horizon can't get out any more, even if if it moves at the speed of light.
What is the difference between the inner event horizon and outer event horizon?
the event horizon is an imaginary spherical or ellipsoidal shell at a certain altitude above the singularity of the black hole, the shape and altitude above the singularity of this imaginary shell depends on only three properties of the singularity: mass, spin, and charge. the event horizon shell is not solid and so things fall through it quite easily, but nothing inside it can go outside it including lighta black hole has no surface, only a singularity of infinite density at its center
Why the event horizon of a black hole stop the light from getting rid of that?
At the point of the event horizon, the pull of gravity is so strong that the escape velocity reaches the speed of light. As such, when light reaches this point, it cannot escape.
Is there any other black hole gravity apart from the event horizon?
Gravity is towards the center of the black hole. The event horizon is not what attracts objects - it is simply the "point of no return".
How does the event horizon affect space?
This is a pretty vague question, but an event horizon is essentially the "point of no return" in a black hole. It is where the fabric of space-time is beginning to bend and soon rip.
What can escape a black hole?
Simply put, nothing can escape a black hole. Not even light. The only matter than has even remotely 'escaped' (and I use the term loosely) a black hole is just "lucky". Some matter is saved at the brink and thrust light years into space. Once something crosses the Event Horizon, however, that's it. The Event Horizon is the point of no return.
