Blackhole means what? what will be it really from?

Question

Blacckhole is a dark spot in unniverse which aiso absorbs the speed of light.

Answer 1

a black hole is NOT a "dark spot" in the universe. it is a collection of extremely dense VERY large mass which has gravitational power capable of sucking in light (not "absorb the speed of light"). because even light does not escape a black hole, we do not know what one looks like, because one cannot be observed with the human eye or any light sensing equipment. the only reason we know black holes exist is because we can see their effects and theorize the cause. fortunately, this theorizing is most likely right on.

Answer 2

the concept of the black hole has been around for quite some time, it is only very recently that astronomers have found solid (if still somewhat indirect) evidence that they truly exist.

It is believed that black holes form when a very massive star (much more massive than our sun) exhausts its nuclear fuel and collapses under the force of its own gravity. During this collapse, the core of the star is crushed, achieving such high density that its gravitational field prevents all light and matter from escaping it. It is gravity, not magnetism, that prevents us from seeing a black hole directly. However, this gravity has a powerful effect on matter nearby the black hole, and observational evidence for their existence comes from measurements of material (gas and/or starlight) moving at tremendously high velocities in the vicinity.

Ultra-massive black holes apparently also exist in the cores of some, perhaps many, galaxies -- black holes with masses ranging from a million to a billion times that of our sun. Exactly how these formed, we do not know: it may taken place during the original gravitational collapse of material during the formation of the galaxy itself, or perhaps such later when gas and other matter gets funneled to the center of the galaxy due to interactions with other neighboring galaxies. Recent Hubble Space Telescope observations, as well as other data from ground-based telescopes, have shown that their presence in some nearby galaxies is almost a certainty.

Answer 3

A Blackhole is a dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light. Black holes are thought to result from the collapse of certain very massive stars at the ends of their evolution.

Answer 4

A blackhole is a black body with no mass but tonnes of weight.
By a "Black Body", we mean a body from which no light can escape. Similarly, a blackhole does not let any light or matter escape from it. Not only this; it even sucks any kind of matter or light coming near it. It has an energy capable of sucking a whole universe.

Answer 5

actual, a black hollow is already if truth be told a geometric factor, with efficiently countless density. there's no inherent decrease to the mass of a black hollow. there's a area around black holes referred to as the form horizon. as quickly as something, which includes sunshine, crosses the form horizon, it could in no way get away. that's what supplies the black hollow its call. the size of the form horizon gets extra suitable because of the fact the black hollow gets extra vast. this allows the black hollow to "improve", in a feeling, as extra mass falls in. there is particularly good info that some galaxies have black holes as vast as one thousand million Suns at their centers. something that falls right into a black hollow gets heated to very severe temperatures (this is how the ten% of the flexibility gets radiated away... the textile gets very heat, in a technique equivalent to how meteors and area debris expend as they enter the Earth's ecosystem). additionally, as quickly as the textile gets very close to to the blackhole, tidal forces will stretch it very skinny (basically think of on the subject of the end result that a Moon has on the earth's oceans, and a typical blackhole is possibly to be plenty extra vast than the Moon).

Answer 6

black hole means a body which is so much condenesed and its gravity is so much so that even the light cant escape.it is usually formed as the result of dying of a star whose weight is much more than the sun. if u need more information then i can give later.i dont know how much u want to know but i can tell in detail how its formed. ask me

Answer 7

ok here it is.... black hole is nothing but the dead of the star. the star will be dead after few thousands years depending upon the size when it is in dead way then the star will explode are turn in to clumsy so a hole ll be created that do we call it as a black hole. when u pass on the light to it the light ray ll be bend through to the hole

Answer 8

A black hole is a spot between any galaxy which is very minute but is very dense. It has such a high gravity that even light can not escape its gravity!

Answer 9

black holes are the remaning part of a death star
when a star like sun is explode and its particles are throw in to a point it will have more and more gravitation even light can't go out

Answer 10

I INTRODUCTION
Black Hole, a hypothetical body with a gravitational field so strong that nothing, including electromagnetic radiation, can escape from its vicinity. The body is surrounded by a spherical boundary, called the event horizon, through which light can enter but not escape; it therefore appears totally black. Such a field can belong to a high-density body, of relatively small mass—equal to the Sun's or less—that is compressed into a very small volume; or to a low-density body of very great mass, such as a collection of millions of stars at a galaxy's centre.

II PROPERTIES

The black-hole concept was developed by the German astronomer Karl Schwarzschild in 1916 on the basis of Albert Einstein's theory of general relativity. The radius of the event horizon of a Schwarzschild black hole depends only on the mass of the body: in kilometres it is 2.95 times the mass of the body in solar units—that is, the mass of the body divided by the mass of the Sun. (For the radius in miles, the corresponding factor is 1.83). If a body is electrically charged or rotating, Schwarzschild's results are modified. An “ergosphere” forms outside the event horizon, and between the ergosphere and the event horizon matter is forced to rotate with the black hole; in principle, energy can be emitted from the ergosphere.

According to general relativity, gravitation severely modifies space and time near a black hole. As the event horizon is approached, time slows down relative to that of a distant observer, stopping completely on the horizon. Once a body has contracted to within its Schwarzschild radius, it will theoretically collapse to a singularity, that is, a dimensionless object of infinite density.

III FORMATION

Black holes may form during the course of stellar evolution. As nuclear fuels are exhausted in the core of a star, the pressure associated with the heat they produce is no longer available to resist gravitational contraction of the core to ever higher densities. Two new types of pressure arise at densities a million and a million billion (1015) times that of water, respectively, and a compact white dwarf or a neutron star may then form. If the core mass exceeds about 1.4 solar masses, however, neither of these types of pressure is sufficient to prevent collapse to a black hole.

Astronomers have discovered X-ray emissions from the binary star system Cygnus X-1, in which the primary is a normal star of about 30 solar masses. Doppler shifts in its spectrum show that a companion object of 10 to 15 solar masses must be in orbit around it; evidence exists that the X-rays originate near the companion (see Doppler Effect). Normally such X-rays are produced by an “accretion disc”—a dense, hot disc of gas that forms as the gas from a normal star spirals into a compact object. The companion in Cygnus X-1, because of its mass and invisibility, is thought likely to be a black hole rather than a white dwarf or neutron star. Other potential candidates for a black hole are an X-ray source in a satellite galaxy of our own Milky Way Galaxy, the Large Magellanic Cloud, and another X-ray source located in the constellation Monoceros. Astrophysicists conjecture that many, if not all, galaxies of substantial size contain a “supermassive” black hole at their centre and that these black holes gain in mass as nearby stars spiral into them.

In 1994 the Hubble Space Telescope provided strong evidence that a black hole exists at the centre of the galaxy M87. The high acceleration of gases in this region indicates that an object, or group of objects, of 2.5 billion to 3.5 billion solar masses must be present. The Chandra X-Ray Observatory launched in July 1999 has already produced X-ray images of a number of highly active galactic nuclei, and looks likely to produce further evidence of the existence of a supermassive black hole at the centres of many galaxies.

The British cosmologist and astrophysicist Stephen Hawking has suggested that many tiny black holes, with a mass less than that of an asteroid, may have formed in the early universe. If this is so, many of these black holes could now be too far from other matter to have a detectable accretion disc, and they could even compose a significant fraction of the total mass of the universe. In reaction to the concept of singularities, Hawking has also proposed that black holes do not collapse in this manner but instead form “wormholes” to other universes besides our own.

A black hole of sufficiently small mass can capture one member of an electron-positron pair near the event horizon, the other escaping (see X-Ray: Pair Production). The resulting radiation carries off energy, in a sense evaporating the black hole. Any primordial black holes weighing less than a few billion tonnes would already have evaporated, but heavier ones may remain.