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It doesn't necessarily.
Remember that the gravitational acceleration of a lump of mass, and the force
on things near it, depends on the distance from the center of it.
The Earth has a lot of mass, but you can't get any closer to the center of it
than about 4,000 miles.
The thing about a black hole is that its mass is packed into such a small space
that you can get very close to it. It has colossally huge gravity when you get
colossally close to it.
-- Let's say you weigh 100 pounds on Earth.
-- Let's say there's a black hole that has the same mass as the Earth,
but it's the size of a Basketball.
-- Let's say you walk over to it, until you're 100 feet away from it.
100 feet away from 1 Earth mass, you weigh almost 22 million tons.
It's getting hard to walk, you're starting to sweat, and you look at it
and you say to yourself "Geez, that thing sure has strong gravity!"
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoThey are so dense because they have a giant star (roughly 50X the mass of our sun) compressed so far that light can't even escape. To put this in perspective, think of how big our sun is, then, Scale it up to a size in which 500 suns can fit into it, now compress that to the size , roughly, of the moon. That's why.
Wiki User
∙ 11y agoGeneral relativity says that mass distorts space and time and the more mass, the greater the distortion of space.
A black hole is formed when a mass causes space and time to distort so much that nothing that enters the black hole can ever get out.
It takes a lot of mass, much more than the mass of our sun, to make a black hole.
We can detect black holes because we can observe the effect of the distortion of space around the black hole.
Their "size" of a black hole the region of space called the event horizon. If anything, light or matter, enter the even horizon, then it never comes out. In effect, the size of the back hole is the region of space insize that can't be seen.
Wiki User
∙ 10y agoThe black holes we know of have large amounts of mass because of the method of their formation, which relates to processes of their stellar evolution (or accretion in the case of a galactic core supermassive black hole). A star massive enough to gravitationally collapse into a black hole under its own weight would have had to possess sufficient mass to do so; but the important thing to realize is that black holes can be of any mass; to qualify as a black hole, an object simply needs to have sufficient density that its radius is smaller than its Schwarzschild radius - and the mechanism for creation of a black hole is usually through the effects of a large mass.
For a small mass the Schwarzschild radius is extremely tiny - the Earth's is about 10 millimeters, around the size of a marble. The Schwarzschild radius of the sun is roughly 3 km. Potentially a black hole could be microscopic; but since mechanisms to compress small masses into a sufficiently tiny volume are uncommon, it follows that the black holes we know of happen to be massive.
It's commonly believed that conditions in the early universe just after its creation would have had regions of sufficient density to form black holes - such are called primordial black holes for this reason. It's also possible the particle collisions of sufficient energies could create black holes; such might be created artificially in a particle accelerator, or might be generated naturally as highly energetic cosmic rays collide with particles in our atmosphere.
Another consideration is the life-span of smaller black holes; it's widely accepted that black holes interact thermodynamically with the universe - quantum effects near the event horizon of a black hole cause them to radiate away small amounts of energy, and thus carry mass away from the black hole, an effect often referred to as black hole evaporation. This effect increases with decreasing size, such that the smallest black holes are expected to evaporate the most quickly and, without infalling matter to make up for the lost mass from the effect, would end their lives and disappear with an energetic explosion. Hence, statistics favor that we would encounter evidence of more massive black holes.
Wiki User
∙ 11y agoThe force of gravity between any two objects (say, between you and the Earth) depends on the masses of the two objects, and the distance between the two centres of mass of the objects. The more massive something is, the more gravity it has, and the closer two objects are to each other the stronger the force between them is. If you were going to calculate the force of gravity between you and the Earth, you would use the distance from (more of less) your stomach to the centre of the Earth. Because you are very far away from the planets core (on the surface), the force of gravity is not very strong.
But now imagine that the earth is being squashed in on itself. Earth's mass remains the same, but the surface of the Earth is now getting closer and closer to the centre of the Earth. This must mean that the force due to gravity is getting stronger and stronger, because the distance between you and the centre is decreasing!
We can begin to understand why black holes have so much gravity. In actual fact they are (mostly) not more massive than any regular star. But, because a black hole is very dense it's "surface" is very very close to it's centre, and this allows you to come very very close to the centre of the black hole. It is because you can get very close that the gravity is so strong.
Wiki User
∙ 12y agoThe reason why the gravitational attraction of a black hole is so strong is because of its large mass and density. The more massive and dense an object is, the more gravity it has. A black hole essentially has infinite density, so its gravitational force is huge.
Wiki User
∙ 10y agoBasically, the force of gravity between two objects depends on the mass (more mass --> more force) and on the distance (greater distance --> less force). A black hole is no exception - it simply has a large amount of mass in a very small space.
Wiki User
∙ 10y agoThe force of gravity depends on the mass (more mass --> more force), as well as on the distance (larger distance --> less force). A black hole has a lot of mass concentrated in a small space.
Wiki User
∙ 8y agoThe gravity of a black hole is so strong because a very large mass is concentrated in a tiny area.
Wiki User
∙ 10y agoThe gravitational force of a black hole depends on its mass, and how far you are from it - this is basically the same as the gravitational force of any other object in the Universe.
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What does gravity have to do with black holes?
Black holes are only theories. They halve not been proven, although it is likely they exist. The theory goes, a large (super massive) mass has so much mass it implodes creating a rift in space time contium. This implosion is due to the extreeme mas of the object, it would be unimajanalbly massive. So the force of gravity created by its own mass makes the mass smaller, too small, until it implodes. Have a look into Special relitivity.
How are gravity and black holes related?
Black holes are the cause of gravity... Black holes are created when a supernova condenses, creating a black hole. It condenses because gravity has won the battle between the star's core. So basically, gravity fuels a Black hole.
Are there more white dwarfs of more black holes?
I think white dwarfs. This is because they are much more low mass than black holes. White dwarfs are much more common in the universe than black holes, because we have only discovered a few black holes whereas we are aware of many white dwarfs.
Why do black holes come in different sizes?
Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.
Have humans invented black holes?
No. We do not have the means to compress matter so much.
How small can black holes get?
A star that stops producing radiation, with a mass about 2-3 times the mass of our Sun (mass remaining after a possible supernova explosion), or more, can become a black hole. There is also some speculation about miniature black holes ("primordial black holes"), with much less mass than that, which might have formed during the Big Bang, because of the enormous density that existed at that time. However, so far there is no evidence that such black holes actually exist.
Is a black hole just a hole in space that contains no matter?
No. Without matter there would be no black hole. The black holes confirmed to exist so far actually have a fairly large amount of matter (or mass) - at least 2-3 times the mass of our Sun. The largest black holes have millions or even billions of times the mass of our Sun.No. Without matter there would be no black hole. The black holes confirmed to exist so far actually have a fairly large amount of matter (or mass) - at least 2-3 times the mass of our Sun. The largest black holes have millions or even billions of times the mass of our Sun.No. Without matter there would be no black hole. The black holes confirmed to exist so far actually have a fairly large amount of matter (or mass) - at least 2-3 times the mass of our Sun. The largest black holes have millions or even billions of times the mass of our Sun.No. Without matter there would be no black hole. The black holes confirmed to exist so far actually have a fairly large amount of matter (or mass) - at least 2-3 times the mass of our Sun. The largest black holes have millions or even billions of times the mass of our Sun.
How does a black holes acquire greatest mass?
Most black holes are stellar mass black holes with masses comparable to those of large stars as they form from the collapse of massive stars. Scientists know of the existence of supermassive black holes that are millions to billions of times the mass of our sun and can be found in the centers of most galaxies. Scientists still do not know how these black holes become so massive.
What does gravity have to do with black holes?
Black holes are only theories. They halve not been proven, although it is likely they exist. The theory goes, a large (super massive) mass has so much mass it implodes creating a rift in space time contium. This implosion is due to the extreeme mas of the object, it would be unimajanalbly massive. So the force of gravity created by its own mass makes the mass smaller, too small, until it implodes. Have a look into Special relitivity.
Does a galaxy contain black holes?
Not really "a" black hole - many black holes. It is currently believed that all, or most, galaxies have a huge black hole at its center. Any galaxy should also have lots of smaller black holes - so-called "stellar" black holes, because they have approximately the mass of a star (larger stars can become black holes).
How are gravity and black holes related?
Black holes are the cause of gravity... Black holes are created when a supernova condenses, creating a black hole. It condenses because gravity has won the battle between the star's core. So basically, gravity fuels a Black hole.
How does a black hole have extreme mass?
Not all do - most black holes have masses comparable to that of a star; this makes sense, since they are believed to have formed from collapsing stars. There are, however, black holes that have thousands, millions, or even billions of times the mass of our Sun - called intermediate black holes, or (for about a million solar masses or more), supermassive black holes. It is currently unknown how exactly they got so massive.
Are there more white dwarfs of more black holes?
I think white dwarfs. This is because they are much more low mass than black holes. White dwarfs are much more common in the universe than black holes, because we have only discovered a few black holes whereas we are aware of many white dwarfs.
Is a black hole bigger than galaxy?
No. At least, the black holes in existence so far are much smaller in size, and have much less mass, than a galaxy. However, note that the black hole in the center of the largest galaxies can have more mass (but not more diameter) than some dwarf galaxies.
Where the value g is infinity?
The value of g is infinity in the case of intense gravity means where there will be more mass there will be more gravity and the black hole is the place where there is too much mass and too much gravity so the answer of your question is that in the singularities or in the black holes the value of g becomes infinity.
How can black holes be destoyed?
Black Hole simply cannot be destroyed because Black holes have so much Gravity That even light cannot pass or go from near the black holes. Black Holes pull the object passing from 10,000,00 (10 Lakh) away from them. So nobody can go near them to destroy it
Why do black holes come in different sizes?
Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.Because of their previous history. The star that converted to a black hole may have had more or less mass for a start. Also, a black hole can increase in mass when matter falls into it, so depending on the amount of matter available for the black hole, the results may vary.However, it is not yet known how the galactic black holes achieved the enormous mass they have.
