Black hole ??

Question

What is black hole ?
Is it true that black hole is the most dence object in universe ?
a cubic milimeter area of black hole equals to 10,000 kg, is it right ??

Answer 1

Q.What is black hole ?

Black Hole:
Simply put, a black hole is a super dense object that has an intense gravitational pull. A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull.

There are two parts to a black hole, a singularity and a event horizon.

The event horizon is where the force of gravity becomes so strong that even light is pulled into the black hole. Although the event horizon is part of a black hole, it is not a tangible object. If you were to fall into a black hole, it would be impossible for you to know when you hit the event horizon.

The singularity is not really a tangible object either. According to the General Theory of Relativity the Singularity is a point of infinite space time curvature. This means that the force of gravity has become infinitely strong at the center of a black hole. Everything that falls into a black hole by passing the event horizon, including light, will eventually reach the singularity of a black hole. Before something reaches the singularity it is torn apart by intense gravitational forces. Even the atoms themselves are torn apart by the gravitational forces.

Schwarzschild Radius:
The Schwarzschild radius is a characteristic radius associated with every mass. It is the radius for a given mass where, if that mass could be compressed to fit within that radius, it will continue to collapse into a gravitational singularity.Simply put, it is the radius, according to the general theory of relativity, at which a body would become a black hole.

It can naively (although incorrectly) be derived by letting the escape velocity of a black hole equal to the speed of light. The formula for the Schwarzschild radius can be found by setting the escape velocity to the speed of light, and is

R_s = 2*G*M/c^2

The proportionality constant, 2G / c2, can be approximated as 1.48×10−27 m/kg. For the Sun, Rs = 2.5 km; for Earth Rs = 0.9 cm.

You can use the Schwarzschild radius to calculate the "density" of the black hole - i.e., the mass divided by the volume enclosed within the Schwarzschild radius. This is roughly equal to (1.8x1016 g/cm3) x (Msun / M)2, where M is defined as above. From the point of view of an outside observer, this might as well be the actual black hole density, since the distribution of matter within the Schwarzschild radius has no effect on the outside.

However, it is conjectured that at the singularity the density is infinite. This is because, all the mass of the black hole is assumed to have fallen into the singularity which has zero spatial extent. But since we do not “see” inside a black hole, we never know for sure what actually happens at the singularity.

Q.Is it true that black hole is the most dence object in universe ?

Yes.

Q. A cubic milimeter area of black hole equals to 10,000 kg, is it right ?

Much more actually. You can work out the "density" from the formula given above. It actually depends on the mass of the black hole.

Cheers.

Answer 2

Hi, Poem,

unfortunately your question is not easy to answer, as the 'experts' (scientists, astronomers, etc.) do not 'know'.

There are several (possibly hundreds) of explanations about what a 'black hole' is.

The most popular is that a 'black hole' is a collapsed star that has shrunk in size to minute proportions, yet which retains its original weight. This provides a minutely dense object, which still exerts the full gravitational pull of the original star.

If this is true, the 'pull' will be intense (our own sun exerts enough pull to maintain the solar system around it)

However, as no-one has observed what happens if something is subject to this intense gravitational field, the 'guesses' of what happens to matter/time/etc., are just that...guesses.

All that has been observed, so far, are anomalies in space, which 'could be explained' (parenthesis intended) by the existence of an object such as the assumed 'black hole'. These anomalies included irregular orbits of stars and planets, unexplained variations of 'flicker' in the light from stars and similar (very remote) irregularities.

So...take your pick from the hundreds of 'explanations' and you will be just as 'proven' as the scientists.

If the 'collapsed star' theory is correct, then the weight calculation of 10 tonnes per cubic millimeter could well be correct.

That is if there actually is something called a 'black hole'...hmmm!

Hope that helps,

BobSpain

Answer 3

i'm not sure how dense it is, but i hear like a teaspoon weighs ALOTTTT!!! A black hole is simple, but first you need to know what a galaxy is. We live within the Milky Way Galaxy. Most galaxies look like a fried egg. The yolk in the middle is the galactic core and the white part of the egg is the galactic plane that we live reside on. We live about in the middle of the white egg. Anyways, the galactic core on every galaxy, billions and billions, is a Supermassive Blackhole. Think of our galaxy as a shower drain with suds swirling around it getting sucked down. From time to time our galaxy gets active and starts sucking matter into it. Their is 400 billions stars in the Milky Way. Every galaxy has a supermassive black hole in the middle of it. Basically a blackhole is like a backed up shower drain, the pipe below the drain cover is filled with water, making it really really heavy so a blackhole is so heavy and dense that it even sucks the light into it. Hense blackhole. I heard a neutron star is very dense, close to a black hole. One teaspoon weighs as much as our earth. A blackhole has an Event Horizon, which is basically the edge of Niagara Falls, once passed the event horizon no coming back.Then you ride down the blackhole and stretch till death farther down the singularity and then some scientists believe that the sucked in matter spits out on the otherside of another universe. Like swiss cheese style. So you have a blackhole on one side of the universe and then you have a whitehole on the other side of another universe. A whitehole blows material outward, instead of inward. email me if you want more info. Wikipedia.org is a lot of help too.

Answer 4

Yes you are correct. The actual density may vary between different black holes but as an example your equation is good.
Perhaps the density has a mathematical maximum before the black hole becomes or does something different? A black hole is so strong it actually sucks/draws in light energy hence the name black hole.

Answer 5

If a black hole could exist it would be an entity whose surface orbital velocity would be the speed light.
A two solar mass star,compressed down to about 3km in diameter would fit this criteria.
With a surface orbital velocity of the speed of light,to escape the surface would require a speed in access of "C"which is generally agreed cannot be.
It is a theoretical entity that is very logical but when analyzed with vigorous logic,it cannot exist.

Answer 6

Yes it is true. But do you know that nothing can escape from the Black Hole not even light so what i said in the above statement is true.

Answer 7

A black hole
is the Hoover system for the universe
it sucks beyond belief !! And, scientist are still wondering Who is the one changing the bags !!!
And, it is more an entity than an object !!

Answer 8

Black hole have singularity at center surrounded by event horizon at singularity the density is infinite so measuring weight by volume is not possible probably even theoretically. at singularity.

Answer 9

I have a friend who has described his sister as a Black hole. I can't remember what he said she weighed, but he did say she was trying to suck everything in the universe.

Answer 10

yes
it is true