Bolle23:
So what are you telling me is that Hydroen is not denser than Iron or any of 24 element in between? Maybe i have completely wrong view point on this...
You need to specify what you're actually talking about. A hydrogen
atom is very different from a hydrogen
nucleus, both of which are very different from a hydrogen
molecule.
Also, the density of every substance varies depending on the state of matter it is in: solid, liquid or gas.
In other words, density depends on much more than just what kind of nucleus you're dealing with. Density is also something that is usually applies to
collections of atoms, nuclei, molecules etc. It is not something that an
individual atom/nucleus/molecule has.
Question is.. what are building blocks of atomic nucleai?
Neutrons and protons, both of which are in turn made up of quarks.
I was reffering to those... how can we be certain that black holes are not "made" of those buliding blocks, same as we are certain that neutron stars are made of atomic nuclei?
One problem is the question of what would hold the matter in place, against the force of gravity trying to compress it. We know what holds the neutrons in a neutron star in place, for example. It is called "degeneracy pressure", which has to do with the Pauli exclusion principle. Two neutrons cannot share the same quantum state, which means that they must maintain a minimum separation if they are to remain neutrons.
But in a black hole, the "force" of gravity is stronger than the supporting force of degeneracy pressure that prevents a neutron star from collapsing in on itself. So, if you want to propose a black hole made of matter, you're
also going to have to suggest what is going to stop that matter from collapsing into the centre of the hole. As far as current physics goes, we're not aware of
any force or effect that can do that trick.
You dont normaly have atomic nuclei floating as is in nature, but when it comes to creation of neutron stars, everything else is shed and that is all that is left.. why we cant have one more step in same direction?
The next "step" after a neutron star is a black hole.
Can we be sure that atomic nuclei are on bottom of size scale and that they are one "solid mass" not comprised from smaller "stuff"... smallest building block in observable universe?
Atomic nuclei consisting of protons and neutrons are
not on the bottom of the density scale. Nuclei can be compressed further if all the protons are turned into neutrons - which is
exactly what happens when a star collapses to become a neutron star.
As far as I am aware, a neutron matter cannot be further compressed into a denser state without collapsing to a black hole.
I dont understand this... How can something have defined diameter but have infinite radius? Something there is not right...
It has to do with curved geometry. For a circle in "flat" space, the circumference is always equal to pi times the diameter. But the inside of a black holes isn't a flat space. So, in the case of a black hole, the circumference can be much smaller than pi times the distance to the centre of the hole, measured in the curved space.
To give you an analogy, picture the Earth as a sphere. Now, imagine drawing a very large triangle on the curved surface of the Earth, as follows: one corner is at the north pole. The second corner is on the equator at 0 degrees longitude, and the third corner is also on the equator, at 90 degrees longitude. Connect up all three corners with "straight lines", drawn along the Earth's surface.
What do you notice about this triangle on the curved surface? First, notice that the internal angles of the triangles do not add up to 180 degrees like the angles in a triangle on flat paper. In fact, with the construction I just described, the angles add up to 270 degrees. Second, the area of this triangle is no longer equal to one half the "base" times the "height". The true area is actually larger than that.
So, you see that in a curved geometry the usual rules relating quantities like the circumference of a circle to its radius do not necessarily apply.
I find that nature itself and processess in nature are quite simple...
Then all I can say is that you have not studied them enough!
I imagine black hole as a real, "solid" object of imense density and mass, nothing mystical about it..
You need to address the objection to this that I have raised above, then. What stops the collapse?
I would say I agree with you on this.. but on other side, we are probably not really sure that all quasars are older than our "closer" black holes...
A quasar is not fundamentally different from any other black hole. A quasar is just a subtype of what astronomers call an "active galactic nucleus", which is a supermassive black hole. The specific point of difference for quasars is that they are observed to emit more electromagnetic energy than your average supermassive galactic black hole. The reason is thought to have to do with the fact that quasars are usually seen in galaxies that are interacting or merging with other galaxies, which probably means there is more matter in the accretion disk of the quasar black hole that can "power" the emissions.
... but we can say thay are more frequent in early universe... i guess that early univers was denser, and maybe all these processes happen quicker...
Well, all the galaxies were closer together than they are today, which might mean that there were more mergers and such back then. So, that makes some kind of sense.
According to Google, nearest one is around 580 million light years, but average distance is measured in billions of light years...
They are
all extra-galactic objects, because they are the black-hole nuclei of other galaxies.
I was certain that process when star "switch" to new type of fuel it not peacefull transition... but followed by some violent activity...
Typically, I think that when one kind of fusion ends and the next begins, the power output of the star increases. There is often also further collapse of the star and, I think, this can be accompanied by the star shedding layer of material outwards. But then the star can settle down for many more millions of years, before the next phase happens.
We are yet to discover "carrier" responsible for gravity force.. right?
We don't have a generally-accepted quantum theory of gravity. We don't know exactly what to look for when it comes to gravitons, or how to look for them. We
do have some ideas about some properties they must have, if they exist, however.
I think there is so much more empty space on size scale, from particles we know of to Planck lenght...
Why do you think that? Is this just another random musing of yours?
In my mind there must be something responsible for gravity force.. some "carrier"...
Gravitons are the postulated "carriers".
Yes, as far as we understand Hawking radiation is only thing that can leave black hole...as far as we understand...
But if you look in history, we didnt understand bacterium and viruses until we had right technology...
I don't think anybody here is going to argue our understanding of science won't improve in future.
Im not aware of any other mechanisms... but i had an idea... silly one..maybe... but it is what it is...
What is it?