Definition of event horizon in English:

event horizon


  • 1A notional boundary around a black hole beyond which no light or other radiation can escape.

    • ‘An accretion disk forms as matter accelerates toward the event horizon of the black hole.’
    • ‘Something at the event horizon of this black hole was trying to escape.’
    • ‘The event horizon is where light loses the ability to escape from the black hole.’
    • ‘They say that once you cross the event horizon of a black hole there's no escape - but that just sounds like loser talk to me.’
    • ‘This causes space-time in their vicinity to be literally dragged around them in a gravitational vortex, forming a region around their event horizon called the ergosphere, in which it would be impossible to stand still.’
    1. 1.1A point of no return.
      ‘we're nearing the event horizon of the presidential election’
      • ‘Beyond the event horizon of our own evolutionary history there may lie the colossal remains of a hundred different would-be histories of intelligent life on Earth.’
      • ‘What humour there is is really so black that it could never escape the event horizon of laughter.’
      • ‘Then there the half dozen or so novels that constantly threaten genius without ever actually crossing that weird event horizon that demarcates the truly great, from the merely talented.’
      • ‘Gosh only knows how, but alcohol was consumed and the event horizon of my return to Cambridge kept receding.’
      • ‘Finally, we explore risk-adjusted returns between acquirers of private and public targets over several event horizons.’
      • ‘There's no threshold to reach, event horizon to cross, or moment of novelty to await.’
      • ‘However, while this black memory hole is expanding cancerously out from Washington, its event horizon is in New York, at the United Nations, where people seem to have longer memories.’
      • ‘It's so geeky that it collapses into a geek singularity and falls behind the geek event horizon.’
      • ‘Probes pushed down her throat were destroyed without returning any useful information, as if there were some kind of event horizon just past whatever served her as vocal cords.’
      • ‘With the bending of time around the event horizon of advanced capitalism, does change itself disappear?’
      • ‘Striking below an opponent's event horizon is a sound tactical strategy, and a concept that underlies all of our training.’
      • ‘Whereas Adam's sin closed the event horizon to the heavenly dimension for mankind, the forgiveness of sin opens this event horizon.’