event horizon
12
9.9
- noun
- /ɪˈvɛnt həˈraɪzən/
- Specialized
:
horizonte de sucesos
- The event horizon marks the point at which not even light can escape the gravitational pull of a black hole.
- event horizon of a black hole
Then it's the area of the event horizon in square plank lengths.
- Then it's the area of the event horizon in square plank lengths.
- You're passing the event horizon of a black hole.
- And if you are crossing over the event horizon, it's just normal.
- You said early at the beginning that the event horizon is not some wall.
- The radius of the event horizon is known as the Schwarzschild radius.
- And as that mass increases, the event horizon becomes larger.
- So when time is slowing down, as you approach the event horizon, what's happening to space?
- The entropy turns out to be equal to equal to the surface area of the event horizon in what's called square plank lengths.
- So inside the event horizon we know that all the matter collects at a point.
- Some black hole analog can even experience their own event horizons and those those you can see with your own eyes.
Examples
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The photons produced along the event horizon become valuable probes of the nature of the black hole.
Academic text (1990) -
Once you pass pass the event horizon, you cannot send a message to the outside world.
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You said early at the beginning that the event horizon is not some wall.
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If anything gets closer to the black hole then this event horizon, there is no going back out.
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So if the clock were right at the event horizon, it would just completely stop.
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Here we are at the event horizon of a black hole.
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If I kept going and passed through the event horizon, would my image really be captured there forever?
Fiction book (1995) -
We're past the event horizon, but we're still falling and falling.
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However, when all of this frenzy occurs near the event horizon of a black hole, something quite amazing may happen.
Academic text (2000) -
To a distant observer, the event horizons cast shadows due to the bending of light by a black hole.
Academic text (2018)
Surface Forms
Morphology
event + horizon
The constituents 'event' (an occurrence) and 'horizon' (a boundary or limit) give a plausible clue that the phrase denotes some kind of boundary related to occurrences, so learners may grasp a vague sense of a limiting line. However, the specific relativistic meaning — the black-hole boundary beyond which nothing can escape — is technical and not directly predictable from everyday senses of the parts, so a B1 learner who only knows the basic words is unlikely to infer the full meaning.
Etymology
Event horizon comes from two simple images: event (something that happens) and horizon (the line where the sky meets the earth and hides what is beyond). So the name paints a picture of a 'boundary' around a black hole where events vanish and 'nothing can escape' back to the outside.