Education
- How Information Can Escape From A Black Hole?
Every black hole conceals a secret — the quantum remains of the star from which it formed, say a group of scientists, who also predict that these stars can later emerge once the black hole evaporates. The researchers call these objects "Planck...
- Amazing Facts About Black Holes:
If you fell into a black hole, theory has long suggested that gravity would stretch you out like spaghetti, though your death would come before you reached singularity. But a 2012 study in Nature suggests that quantum effects would cause the...
- Why Should We Wear White Clothes In Summer?
Generally we prefer to wear white t-shirts or white shirts . You may have studied about black body in your school or college level.I had learnt that black body is a good absorber of heat and radiation and a perfect black body can absorb all the radiations...
- History Of The Black Hole Theory
A black hole in space has gravitational force so strong that nothing can escape from it, not even light. Hence no one can see a black hole astronomers are convinced they exist. John Michell, a British geologist and astronomer, designed the experiment...
- English Breakfast Tea
The prototype of this most popular of all teas was developed over a hundred years ago by the Scottish Tea Master Drysdale in Edinburgh using black Indian and China teas to create a strong brew to drink with milk. By the 1700s, it become indoctrinated...
Education
What is Black Hole?
Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough.
Albert Einstein first predicted black holes in 1916 with his general theory of relativity. The term "black hole" was coined in 1967 by American astronomer John Wheeler, and the first one was discovered in 1971.
There are three types: stellar black holes, supermassive black holes and intermediate black holes.
Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Such an object packs three times or more the mass of the sun into a city-size range. This leads to a crazy amount of gravitational force pulling on objects around it. Black holes consume the dust and gas from the galaxy around them, growing in size.
According the Harvard-Smithsonian Center for Astrophysics, "the Milky Way contains a few hundred million" stellar black holes.
Scientists aren't certain how such large black holes spawn. Once they've formed, they can easily gather mass from the dust and gas around them, material that is plentiful in the center of galaxies, allowing them to grow to enormous sizes.
Supermassive black holes may be the result of hundreds or thousands of tiny black holes that merge together. Large gas clouds could also be responsible, collapsing together and rapidly accreting mass. A third option is the collapse of a stellar cluster, a group of stars all falling together.
In 2014, astronomers found what appeared to be an intermediate-mass black hole in the arm of a spiral galaxy.
"Astronomers have been looking very hard for these medium-sized black holes," co-author Tim Roberts, of the University of Durham in the United Kingdom, said in a statement.
"There have been hints that they exist, but IMBH's have been acting like a long-lost relative that isn't interested in being found."
Albert Einstein first predicted black holes in 1916 with his general theory of relativity. The term "black hole" was coined in 1967 by American astronomer John Wheeler, and the first one was discovered in 1971.
There are three types: stellar black holes, supermassive black holes and intermediate black holes.
Stellar black holes — small but deadly
When a star burns through the last of its fuel, it may find itself collapsing. For smaller stars, up to about three times the sun's mass, the new core will be a neutron star or a white dwarf. But when a larger star collapses, it continues to fall in on itself to create a stellar black hole.Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Such an object packs three times or more the mass of the sun into a city-size range. This leads to a crazy amount of gravitational force pulling on objects around it. Black holes consume the dust and gas from the galaxy around them, growing in size.
According the Harvard-Smithsonian Center for Astrophysics, "the Milky Way contains a few hundred million" stellar black holes.
Supermassive black holes — the birth of giants
Small black holes populate the universe, but their cousins, supermassive black holes, dominate. Supermassive black holes are millions or even billions of times as massive as the sun, but have a radius similar to that of Earth's closest star. Such black holes are thought to lie at the center of pretty much every galaxy, including the Milky Way.Scientists aren't certain how such large black holes spawn. Once they've formed, they can easily gather mass from the dust and gas around them, material that is plentiful in the center of galaxies, allowing them to grow to enormous sizes.
Intermediate black holes – stuck in the middle
Scientists once thought black holes came in only small and large sizes, but recent research has revealed the possibility for the existence of midsize, or intermediate, black holes (IMBHs). Such bodies could form when stars in a cluster collide in a chain reaction. Several of these forming in the same region could eventually fall together in the center of a galaxy and create a supermassive black hole.In 2014, astronomers found what appeared to be an intermediate-mass black hole in the arm of a spiral galaxy.
"Astronomers have been looking very hard for these medium-sized black holes," co-author Tim Roberts, of the University of Durham in the United Kingdom, said in a statement.
"There have been hints that they exist, but IMBH's have been acting like a long-lost relative that isn't interested in being found."
- How Information Can Escape From A Black Hole?
Every black hole conceals a secret — the quantum remains of the star from which it formed, say a group of scientists, who also predict that these stars can later emerge once the black hole evaporates. The researchers call these objects "Planck...
- Amazing Facts About Black Holes:
If you fell into a black hole, theory has long suggested that gravity would stretch you out like spaghetti, though your death would come before you reached singularity. But a 2012 study in Nature suggests that quantum effects would cause the...
- Why Should We Wear White Clothes In Summer?
Generally we prefer to wear white t-shirts or white shirts . You may have studied about black body in your school or college level.I had learnt that black body is a good absorber of heat and radiation and a perfect black body can absorb all the radiations...
- History Of The Black Hole Theory
A black hole in space has gravitational force so strong that nothing can escape from it, not even light. Hence no one can see a black hole astronomers are convinced they exist. John Michell, a British geologist and astronomer, designed the experiment...
- English Breakfast Tea
The prototype of this most popular of all teas was developed over a hundred years ago by the Scottish Tea Master Drysdale in Edinburgh using black Indian and China teas to create a strong brew to drink with milk. By the 1700s, it become indoctrinated...