question about black holes?

Question

first how does a black hole have such an enormous gravitational pull? alsohow heavy is a black hole exactly? ive heard that if somethin with mass moves at the speed of light it has nearly infinite weight...is that true? and if so would somethin movin that fast be heavier than a black hole? ive also heard that black holes grow in wieght but not mass(unless i guess if 2 black holes merged together or somethin)...true?

and im not sure if any1 can answer this question but how in the wrld is a black hole infintly deep? that doesnt make any sense to me.

oo so mass and weight r technically the same? ic..thx. i gues wat i mean to say is how it gains mass but doesnt get bigger...althou i think some of u answered this question too...rite?

Answer 1

You have a lot of questions, so let's make some aclarations:

1) The enormous gravitational pull of a black hole, comes from the gravity pull of the mass it is composed.

2) A black hole it's as heavy as the mass of the star it came from.

3) if something with mass moves at the speed of light it has infinite weight. That's why anything with mass can move in such speed.

4) In physics when you talk about weight you really mean mass. The word weight it self doesn't have any meaning in black holes.

5) No one knows exactly about the deepness of a black hole. Some theories said that it could be "infinitly deep" meaning that it could end in another universe.

Answer 2

There are some good answers here. When a star like our sun dies it shrinks to a small white dwarf and eventually cools to be no more than a cinder. Larger stars can collapse and become a super nova and leave behind a very dense body called a neutron star, this is still not a black hole. A super massive star can collapse into a black hole, the great mass of the black hole curves the space around it so tightly that lightt can't escape from it, the ligh circles the black hole in what is called it's event horizon, any mass that goes beyond this point becomes part of the black hole and adds to it's mass. A large black hole is probably a few miles in diameter, it is not infinitely deep. Because light can't escape from a black hole it can't be seen but astronomers can detect the effect of it's great gravity on nearby stars as the gases from the star are drawn into the black hole.

Answer 3

It's not so much the gravity that's enormous. It's the amount of mass in such a small area.

You're standing on Earth. It's 8000 miles in diameter, and you're 4000 miles out from the center. You weigh 150 pounds.

Suddenly, the entire mass of Earth shrinks to a dimensionless point - a black hole. Around this new black hole is it's Event Horizon - and it's about 1 1/2 inches in diameter (about 1/2 the size of a golf ball.) If you were able to maintain your position - 4000 miles out from the newly formed black hole, you'd *still* weigh 150 pounds.

Now, as you fall toward the black hole that was Earth, your speed increases. If you had the ability to stop and hold position out from the black hole, you'd note that your weight is increasing. So, at 3000 miles, you stop, and weigh yourself, and your weight has nearly doubled. At 2000 miles, it's 8 times what it was, and so on.

The reason is, mass warps space, and warped space defines gravitational pull. The Gravitational "well" we experience at the surface of Earth is much less steep than if the same amount of mass occupied 1/2 the volume. As the volume shrinks, you can be *closer* to alllllll that mass that gives you weight. The closer you are to a lot of mass, the more you weigh.

Now - the black hole we talked about has the same amount of mass as the Earth. So, the moon would continue to orbit like normal, but as the people fell INTO the black hole - the amount of gravity attracting them increases, to and beyond infinity. (Basicaly, a Black Hole is a place where God divides by zero...)

Answer 4

I am not physicist but I can try. A black hole is usually a star that has collapse onto itself. It has a lot of mass because all of the material of the start is compacted into a very small object therefore it has a lot of mass. All particles are compacted into a very small point in the universe. Since it has a lot of mass it has very strong gravitational pull. Gravitational pull is directly related to mass. The more mass, the stronger the gravitational pull. The gravitational pull of a black hole is so strong that not even light can escape it, that is why is called a black whole, since you can't see it, only detect it by is gravitational pull.. Any object that comes close to the black hole will be trapped by is gravity. As far as objects moving at the speed of light, a particle with mass can not be accelerated to the speed of light, only to nearly the speed of light. That is what I can tell you, I hope is clear enough. I work on linear accelerators that accelerate electrons to nearly the speed of light.

Also, the sun will someday die then become a black hole. Imagine the mass of the sun compacted to the size of a pin head. That would be a black hole. Same mass, different size.

Answer 5

a black hole has such an enormous gravitational pull because it used to be a star. when it first forms, it doesn't have a pull any stronger than the star, its pull only increases when it sucks in matter adding to its mass.

a black hole is as heavy as the star it came from plus anything that it has sucked in. if it came from a star 5 times the mass of the sun, and sucked up a star that was 2 times the size of the sun, the black hole would be 7 times as massive as the sun. if something moves at the speed of light, all of its motion energy will be converted into mass. i dont believe it would be infinitly massive, just infinitely hard to accelerate.

Black holes gain mass and therefore weight. weight is just the gravitational force an object exerts on it. mass is the amount of matter in the black hole. it would be next to impossible to measure the weight of the black hole because if it got close to the planet, it would just suck it in before the planet could measure the weight...

a black hole isnt really a hole. its a single point in space with the mass of many stars. imagine filling a football with air enough so it stays inflated. now pump it more full of air. there is more air in the same tiny space. now reduce the football to a size unimaginable small, and "inflate" it with the gas from a star many times the size of the sun. thats one hell of a punt!

Answer 6

What is called a blackhole represents a star or galactic mass that can no longer produce light,because it has burned itself out.The mass would be invisible if it could not reflect light. The rate of Nuclear fusion in stars a depend on the pressure of space.
Some stars burn out very quick while others ,very slow.The reason for this is that Gravity power levels are not homogeneous in the Universe.

Simple mental exercise tells us that the part is less massive than the Whole. That means a very massive star that has burned out is less massive than the original star. Therefore , it would have less gravitational mass ,Hence a smaller
Gravity field. But we cannot say that a black hole is so massive that its gravity field is so strong that it can suck in the whole universe.

A burned out star has less gravity that when it was active.
I dont believe that the science of Cosmology would think otherwise. Therefore a burned out star would follow the rules of gravity just as any other mass structure.

As Einstein postulate indicated "all laws of physics apply the same way in all frames of references."

Answer 7

Black Holes do no longer exist. No Probe or spacecraft has ever been close to a minimum of one and no person on planet Earth has ever considered one up close. it relatively is the main ridiculous theory regularly occurring and dumb sheeple actually believe what they have been instructed with the aid of scientists and astronomers that Black Holes exists while surely they by no potential considered each and every guy or woman they're doing is verifying their own version of outcomes and archives and shoving it in our faces and making want us to believe in this myth referred to as black holes.

Answer 8

There is alot about the universe we don't know. It's no clearly what happens in a Black Hole. Recently i watched on T.V. on the history about life and death of stars. It explained some about black holes.
Basicly the link will tell you about Black Holes and all your other question.
Also an extra thing i know is that black hole gets its name because nothing can escape it, not even light. If you are far away you will be fine.

Answer 9

A black hole is what remains when a massive star dies.

some info here........ http://science.howstuffworks.com/black-hole.htm