the blackhole is a misterious matter in the space, is the blackhole also may be a equal size to swallow our solar sytem as well? or its reality is much more than this ?


sunil

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It's not the physical size (i.e., radius etc.) that makes the black hole so potent, it is its mass. Thus a stellar-mass black hole is only the size of a small city, whereas supermassive black holes can be the size of a small solar system. They "swallow" mass from much larger distances due to their strong gravity.

The Surface of all blackholes is a singularity, a point with no size...

The event horizon- the point of no return - varies according to it's mass...

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oh, thanks, ken G and mickal555. black hole is functioning like a invisible magnetic zone in the space ? how it can be detect in the space if we are en-route in the space?

Hum,
Of course, we do not know this to be true.
i on the other hand suspect the BH could be a few kilometres big, or just under the size of the event horizon...

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How can a subject be without size??????
Basically black hole are bieng formed from compact star running out feul!!
the size of blackhole can be measured by formula and mathematically, I think it has not been seen to prove its size.

The way to "see" a black hole is to watch the hot gas orbiting around it. Gas doesn't usually fall right in, it spirals in like water going down a drain. Thus even if you can't see the drain, you can tell its size by looking at the spiraling water. And yes, the size is usually described by the event horizon, that's the only thing we could ever see.

We can determine what is called the radius of the event horizon, the point of no return, as Mickal55 wrote. Current physics is not very apt at describing what's inside the event horizon.

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"All your bias are belong to us." Ara Pacis
"A witty saying proves nothing." Voltaire

Nitpick.
The radius of the event horizon is infinite. What we can measure is the circumference.

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Any day you wake up on "the right side of the dirt" is a good day.

T. Anderson

I should have written Schwarzschild radius.

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"All your bias are belong to us." Ara Pacis
"A witty saying proves nothing." Voltaire

For reason and logic. To suggest that the surface of a black hole is
the singularity within it, OH My. Thankyou for injecting reality, no, not
Nitpick, but explaining, in clear and concise terms, the understanding of
what we presently know.
Nokton.

That all depends on String Theory, which is for now untestable so we may never know.

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As I understand it, the "size" of a black hole is the size of the event horizon. The size of the singularity is, by definition, undefined.

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Any day you wake up on "the right side of the dirt" is a good day.

T. Anderson

Just wanna jump in for a lil clear up.
All black holes are not singularities. Most astronomers do not believe black holes actuall sizes are dimensionless points. The concept is a discription of how the law of physics fail to describe the object. Rules don't work there anymore. (The main idea is that this object is gravitationally collapse it has reached a point of critical mass. Were gravity exceeds all other forces and becomes dominant. since it collapses and even the mass of the object itself cannot withstand it, the assumtion was made it shrinks to a point.)

The swarchild radius is not the radius of the black hole. It is a theoretical and imaginary limit. This is how its arrived. We know the force of gravity very well. Infact we use it to do space mission, gravity assist maneuvers, infact we know so well we know how much rocket fuel it takes to get off the planet. its called the escape velocity. Every object has one, you, this planet, the moon, mars, the sun. The more massive the object the faster you have to go.

Now imagine an object so massive were 300,000 km/s is not fast enough to escape. This is a black hole. This is the the imaginary swarchild radius, the exact point were the escape velocity of an object is 300,000 km/s. Now black holes are so massive were the swarchild radius is larger that the black hole itself. To determine the swarchild radius you only need to know one thing the mass of the black hole. INFACT!!! you only need to know the mass of anyobject to determine its SWARCHILD RADIUS or its so called event horizon. YOU can determine the swarchild radius of an object by applying this equation Rs=2GM/c^2.
R = radius in meters
G = Gravitational constant
M = mass in kg
c = meters per second

That ladies and gents is what determines if you are a black hole or not. Using that equation the suns Swarchild radius is about 3 km within the sun not a black hole, the earth is even smaller about 1 cm.

now an object like Cygnus X-1 it has reached critical mass and has a larg swarchild radius it dissapears from view becuase the radius is larger than the object and can never be seen or detected again.

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Since there are so many galaxies in the universe does any one mind if I claim one? I need a place to put my stuff.

that's nice bigbluestar, quite a clear picture of B'hole.

sunil