Definition of black hole in English:

black hole

noun

Astronomy
  • 1A region of space having a gravitational field so intense that no matter or radiation can escape.

    • ‘Some of the invisible dark matter that is missing from the Universe may be massive dark bodies such as planets, black holes, asteroids or failed stars.’
    • ‘This universe is very similar to our own, with thousands of stars and galaxies, black holes, comets and meteors each a part in the never-ending celestial dance.’
    • ‘I can only assume, based on our limited understanding of space and time, that the intense gravity of the black hole caused the spacecraft to be thrust back in time.’
    • ‘An astronomy satellite that studied black holes and distant galaxies was wiped out by the one star that it did not watch.’
    • ‘The gravitational field of a black hole is so strong that the escape velocity needed is greater than the speed of light.’
    1. 1.1informal A place where money or lost items apparently disappear without trace.
      • ‘Critics predicted that, without radical change to make the service more accountable, the money would disappear into a black hole.’
      • ‘It's like a big black hole, the money disappears.’
      • ‘The company's finances are formally a black hole, although great hopes rest on the imminent IPO reviving the tech sector.’
      • ‘But the critics assume that Quebecers get nothing in exchange for their tax dollars, that this money is somehow dumped into a great bureaucratic black hole.’
      • ‘They claim that all this extra cash has somehow disappeared into a black hole so massive that even Stephen Hawking could not comprehend it.’
      • ‘Due to the ephemeral nature of the medium, web content often disappears into a black hole.’
      • ‘But in today's changing world, where today's Internet success can easily become tomorrow's black hole, it pays to have partners and spread the risk.’
      • ‘Some sites we have looked at during the last few years have disappeared into the black hole of Cyberspace.’
      • ‘Are these savvy businessfolk simply throwing their money into a black hole?’
      • ‘Dotcoms continue to disappear into the Nasdaq black hole in hot pursuit of the latest startups.’
      • ‘The economics of nuclear energy are insane - it's the most expensive way of generating electricity, a gigantic black hole sucking in taxpayers' money.’
      • ‘But if you can't sell it, then you haven't got any money, what you've got is a big black hole of expense.’
      • ‘Apparently he would like them to disappear into a black hole somewhere.’
      • ‘How many times have you sent an e-mail to a company, only to have that e-mail apparently fall into a black hole?’
      • ‘Publicly owned cars are a very big financial black hole in the country, producing waste and corruption.’
      • ‘They disappear into the black hole existing somewhere in the core of my house.’
      • ‘The single biggest problem with the privatisation programme is that the proceeds disappear into a black hole called the Consolidated Fund of India.’
      • ‘He adopted all these ruinous procedures and a very large percentage of what he thus raised went straight into his financial black hole.’
      • ‘There is plenty of potential - the telecom's £2.5bn black hole alone is the equivalent to the value of a large UK company.’
      • ‘The first disappeared into the great black hole of cyberspace.’
      underground cell, underground prison, oubliette
      View synonyms

Black holes are probably formed when a massive star exhausts its nuclear fuel and collapses under its own gravity. If the star is massive enough no known force can counteract the increasing gravity, and it will collapse to a point of infinite density. Before this stage is reached, within a certain radius (the event horizon) light itself becomes trapped and the object becomes invisible

Pronunciation

black hole