A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star's outer layers are blown away.
When a star 100+ times more massive than the sun dies out and explodes into a supernova, the remains stay in space for a short period of time. Then gravitational collapse causes the remains to form into a spiral-like shape and begin sucking everything in its path, thereby forming a black hole
gravity. Lots and lots of gravity.
Basically, if the size of an object in space doubles in radius, then, the force of its gravity increases by a factor of 8, so gravity increase faster then the size of the object. So as the object keeps increasing in size, its gravity eventually becomes great enough that not even light can escape it.
We don't really know what a black hole looks like, since no signals actually come out of it for us to study.
There are three main types of black holes [See Link]
1) Supermassive - contain hundreds of thousands to billions of solar masses. and are thought to exist in the centre of most galaxies. They have a radius ranging from 0.001 to 10 AU. (Saturn is about 10 AU from the Sun)
The largest known supermassive black hole is located in OJ 287 [See Link] weighing in at 18 billion solar masses
2) Intermediate - contain thousands of solar masses. They have a radius of ~ 103 km. (About the size of the Earth.)
3) Stellar-mass - have masses ranging from a lower limit of about 1.4-3 solar masses. Their size is around 30km - about the size of the Island Maui in Hawaii or the Isle of Wight in Britain.
4) Micro - (also mini black holes) have masses much less than that of a star. They are not known to exist, but predictions and calculations suggest they might. If they do, their mass will equal the moon but will be around the size of a pea!!
The mass remaining after the supernova explosion must be about 3-4 times the mass of the Sun: http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit
The mass remaining after the supernova explosion must be about 3-4 times the mass of the Sun: http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit
The mass remaining after the supernova explosion must be about 3-4 times the mass of the Sun: http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit
The mass remaining after the supernova explosion must be about 3-4 times the mass of the Sun: http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit
From the Wikipedia article, http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit:
"Modern estimates range from approximately 1.5 to 3.0 solar masses"
That would have to be the mass of the remnant, AFTER a supernova explosion, in order to create a black hole. Before that, the star may have a much larger mass, but a lot of that goes away into space during the supernova explosion.
From the Wikipedia article, http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit:
"Modern estimates range from approximately 1.5 to 3.0 solar masses"
That would have to be the mass of the remnant, AFTER a supernova explosion, in order to create a black hole. Before that, the star may have a much larger mass, but a lot of that goes away into space during the supernova explosion.
From the Wikipedia article, http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit:
"Modern estimates range from approximately 1.5 to 3.0 solar masses"
That would have to be the mass of the remnant, AFTER a supernova explosion, in order to create a black hole. Before that, the star may have a much larger mass, but a lot of that goes away into space during the supernova explosion.
From the Wikipedia article, http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit:
"Modern estimates range from approximately 1.5 to 3.0 solar masses"
That would have to be the mass of the remnant, AFTER a supernova explosion, in order to create a black hole. Before that, the star may have a much larger mass, but a lot of that goes away into space during the supernova explosion.
The collapse may be stopped by the degeneracy pressure of the star's constituents, condensing the matter in an exotic denser state. The result is one of the various types of compact star. Which type of compact star is formed depends on the mass of the remnant - the matter left over after changes triggered by the collapse (such as supernova or pulsations leading to a planetary nebula) have blown away the outer layers. Note that this can be substantially less than the original star - remnants exceeding 5 solar masses are produced by stars which were over 20 solar masses before the collapse.[55]
If the mass of the remnant exceeds ~3-4 solar masses (the Tolman-Oppenheimer-Volkoff limit)-either because the original star was very heavy or because the remnant collected additional mass through accretion of matter-even the degeneracy pressure of neutrons is insufficient to stop the collapse. After this no known mechanism (except possibly quark degeneracy pressure, see quark star) is powerful enough to stop the collapse and the object will inevitably collapse to a black hole.
From the Wikipedia article, http://en.wikipedia.org/wiki/Tolman-Oppenheimer-Volkoff_limit:
"Modern estimates range from approximately 1.5 to 3.0 solar masses"
That would have to be the mass of the remnant, AFTER a supernova explosion, in order to create a black hole. Before that, the star may have a much larger mass, but a lot of that goes away into space during the supernova explosion.
Nothing. It's the end of the line.
Black Dwarfs are still hypothetical objects and unlikely to be detected for quite a while.
See related questions.
Gravity. A star will transform into a black hole if it has no more fuel to counteract gravity, and if (after the supernova explosion) the remaining mass is above a certain limit.
Black holes are formed by super massive stars when they collapse. Less massive stars will form neutron stars. Therefore, the original size and mass of the star will determine if a black hole will be created when the star collapses.
A black hole.
When a star collapses all the gravity that it created also collapses creating a wrinkle, fold, hole (hard to explain) in the fabric of space time.
What the core of the star will become is dependent of the mass of the supergiant star. Stars between about 3 and 10 solar masses will generally become neutron stars. Stars above 10 solar masses generally become black holes.
The most massive stars will form ultra large stars, which will collapse into black holes upon their demise.
Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars.
Black holes are formed by super massive stars when they collapse. Less massive stars will form neutron stars. Therefore, the original size and mass of the star will determine if a black hole will be created when the star collapses.
after a neutron star collapses on itself
Neutron stars could form in places where there are high-mass stars. After the star runs out of fuel in its core, the core collapses while the shell explodes into the space as supernova. The core would then become a neutron star, it might also become a black hole if it is massive enough.
A black hole is formed when a star or other large body collapses on itself.
A black hole is an area of such immense gravity that nothingβnot even lightβcan escape from it. Black holes form at the end of some stars' lives. The energy that held the star together disappears and it collapses in on itself producing a magnificent explosion. :)
it takes a lot of pressure to overcome the force of neutron degeneracy, only very massive stars have strong enough gravity to do this at their core. when it happens the core collapses suddenly, becoming a black hole and conservation of momentum ejects the rest of the star as a powerful supernova.
A black hole.
No. Most black holes form when an extremely massive star dies and the core collapses, becoming a black hole.
When a star collapses all the gravity that it created also collapses creating a wrinkle, fold, hole (hard to explain) in the fabric of space time.
Copper can only form in supernova explosions, when a dead star collapses to become either a neutron star or a black hole.
What the core of the star will become is dependent of the mass of the supergiant star. Stars between about 3 and 10 solar masses will generally become neutron stars. Stars above 10 solar masses generally become black holes.