black hole - ορισμός. Τι είναι το black hole
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Τι (ποιος) είναι black hole - ορισμός

ASTRONOMICAL OBJECT SO MASSIVE, THAT ANYTHING FALLING INTO IT, INCLUDING LIGHT, CANNOT ESCAPE ITS GRAVITY
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  • This artist's impression depicts the paths of photons in the vicinity of a black hole. The gravitational bending and capture of light by the event horizon is the cause of the shadow captured by the Event Horizon Telescope.
  • archive-date=13 February 2012}}</ref>
  • Computer simulation of a star being consumed by a black hole. The blue dot indicates the location of the black hole.
  • archive-date=30 May 2016}}</ref>
  • Simulation of two black holes colliding
  • s2cid= 54548877 }}</ref>
  • archive-date=13 August 2014 }}</ref>
  • NASA simulated view from outside the horizon of a Schwarzschild black hole lit by a thin accretion disk.
  • s2cid=119166670 }}</ref>
  • Animated simulation of a [[Schwarzschild black hole]] with a galaxy passing behind. Around the time of alignment, extreme [[gravitational lens]]ing of the galaxy is observed.
  • Simulated event in the CMS detector: a collision in which a micro black hole may be created
  • A [[Chandra X-Ray Observatory]] image of [[Cygnus X-1]], which was the first strong black hole candidate discovered
  • at=page 35, Fig. 3}}</ref>
  • Gravitational time dilation around a black hole
  • archive-date=21 July 2013 }}</ref>
  • Blurring of X-rays near black hole ([[NuSTAR]]; 12 August 2014)<ref name="NASA-20140812" />
  • Alfvén S-waves]], flow from the base of black hole jets.
  • This animation compares the X-ray "heartbeats" of GRS 1915 and IGR J17091, two black holes that ingest gas from companion stars.
  • archive-date=6 January 2015}}</ref>

black hole         
(black holes)
Black holes are areas in space, where gravity is so strong that nothing, not even light, can escape from them. Black holes are thought to be formed by collapsed stars.
N-COUNT
Black hole         
·- A dungeon or dark cell in a prison; a military lock-up or guardroom;
- now commonly with allusion to the cell (the Black Hole) in a fort at Calcutta, into which 146 English prisoners were thrust by the nabob Suraja Dowla on the night of June 20, 17656, and in which 123 of the prisoners died before morning from lack of air.
black hole         
¦ noun Astronomy a region of space having a gravitational field so intense that no matter or radiation can escape.

Βικιπαίδεια

Black hole

A black hole is a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape its event horizon. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. Although it has a great effect on the fate and circumstances of an object crossing it, it has no locally detectable features according to general relativity. In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly.

Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. In 1916, Karl Schwarzschild found the first modern solution of general relativity that would characterize a black hole. David Finkelstein, in 1958, first published the interpretation of "black hole" as a region of space from which nothing can escape. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars by Jocelyn Bell Burnell in 1967 sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality. The first black hole known was Cygnus X-1, identified by several researchers independently in 1971.

Black holes of stellar mass form when massive stars collapse at the end of their life cycle. After a black hole has formed, it can grow by absorbing mass from its surroundings. Supermassive black holes of millions of solar masses (M) may form by absorbing other stars and merging with other black holes. There is consensus that supermassive black holes exist in the centres of most galaxies.

The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Any matter that falls onto a black hole can form an external accretion disk heated by friction, forming quasars, some of the brightest objects in the universe. Stars passing too close to a supermassive black hole can be shredded into streamers that shine very brightly before being "swallowed." If other stars are orbiting a black hole, their orbits can determine the black hole's mass and location. Such observations can be used to exclude possible alternatives such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems and established that the radio source known as Sagittarius A*, at the core of the Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses.

Παραδείγματα από το σώμα κειμένου για black hole
1. The easyJet telephone line is a huge, expensive, black hole.
2. Britain‘s 200 largest schemes already face a 12billion black hole.
3. "We‘ve actually created a legal black hole there," Sen.
4. Some 10,000 low–mass stars formed near the black hole.
5. "The bank is a black hole of indolence and bureaucracy.