The term 'black hole' is particularly appropriate in its application to the astrophysical phenomenon of the same name due to the property of the escape velocity exceeding the speed of light. This means that no light or matter escapes a black hole.
Because nothing - not even light can escape a black hole.
Quasars have a large black hole, called a "supermassive black hole". The term "supermassive black hole" simply means that it has millions or even billions of solar masses.
No non-fictional astronomical body know as black circle. If the question is meant to employ the term 'black hole' in space, what a black hole does is to exist.
No. And the term is "black hole," not "dark hole."
A black hole is a void in space-time where gravity is so strong that no matter or energy can escape the effects of its force.
That depends exactly how you interpret the term "strong". In its vicinity, the black hole distorts space more than anything that is NOT a black hole; so much that nothing can get out of the black hole. But at some standard distance, a galaxy, for example, would have more gravitational attraction than a black hole, simply because it has more mass. At least, so far no black hole of the mass of an entire galaxy has been found.That depends exactly how you interpret the term "strong". In its vicinity, the black hole distorts space more than anything that is NOT a black hole; so much that nothing can get out of the black hole. But at some standard distance, a galaxy, for example, would have more gravitational attraction than a black hole, simply because it has more mass. At least, so far no black hole of the mass of an entire galaxy has been found.That depends exactly how you interpret the term "strong". In its vicinity, the black hole distorts space more than anything that is NOT a black hole; so much that nothing can get out of the black hole. But at some standard distance, a galaxy, for example, would have more gravitational attraction than a black hole, simply because it has more mass. At least, so far no black hole of the mass of an entire galaxy has been found.That depends exactly how you interpret the term "strong". In its vicinity, the black hole distorts space more than anything that is NOT a black hole; so much that nothing can get out of the black hole. But at some standard distance, a galaxy, for example, would have more gravitational attraction than a black hole, simply because it has more mass. At least, so far no black hole of the mass of an entire galaxy has been found.
You are referring to the "event horizon" of a black hole. At this point, nothing, not even light, can escape the gravity of the singularity (or black hole). If you were so unlucky to be there, your body would be stretched from the part that is closest to the black hole. Eventually, your body would be one long string of atoms swirling into the black hole. This is called "spaghettification" and is an actual scientific term.
I believe that would be exactly the term - "active supermassive black hole". The term "active galaxy" or "active radiogalaxy" is also used for a galaxy that produces large amount of certain radiations; however, such radiation is really caused by the supermassive black hole.
The term black hole is a misnomer that implies the notion of a hole; there is no hole, so there is no end (or exit). A black hole is a spherical volume of immense density. Somewhat like the Earth, everything within its gravitational field is attracted to its essense. And just as pressure increases towards the center of Earth, the pressure increases on a more more dramatic scale towards the center of a black hole. However since the subsistence of a black hole is unknown, it might be said that the black hole ends in energy transformation.
Obviously it is possible, but in the short term - or even for the next billion years or so - it is extremely unlikely for Earth to collide with a black hole.
The term "Black hole" first appeared in print in an article by Ann Ewing in "Black Holes in Space" published in 1964 after a meeting of a group of scientists. John Wheeler often gets credit because he used the term in a lecture in 1967, because of which the phrase entered widespread use.
The collapses star gets squeezed by collapses gas and turns into a black hole.
A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.A Schwarzschild black hole is a non-rotating black hole. The Kerr black hole is a rotating black hole. Since the latter is more complicated to describe, it was developed much later.