full transcript
#### From the Ted Talk by Katie Bouman: How to take a picture of a black hole

## Unscramble the Blue Letters

But what happens if we were to zoom in even further? Is it possible to see something that, by definition, is impossible to see? Well, it turns out that if we were to zoom in at radio wavelengths, we'd expect to see a ring of light caused by the gravitational lensing of hot plasma zipping around the black hole. In other words, the balck hole casts a shadow on this bakdrcop of bright material, cnvraig out a sphere of denrksas. This bigrht ring rleeavs the black hole's event horizon, where the gravitational pull becomes so great that not even light can escape. Einstein's equations predict the size and shape of this ring, so taking a puircte of it wouldn't only be really cool, it would also help to verify that these equations hold in the extreme conditions around the black hole.
## Open Cloze

But what happens if we were to zoom in even further? Is it possible to see something that, by definition, is impossible to see? Well, it turns out that if we were to zoom in at radio wavelengths, we'd expect to see a ring of light caused by the gravitational lensing of hot plasma zipping around the black hole. In other words, the **_____** hole casts a shadow on this **________** of bright material, **_______** out a sphere of **________**. This **______** ring **_______** the black hole's event horizon, where the gravitational pull becomes so great that not even light can escape. Einstein's equations predict the size and shape of this ring, so taking a **_______** of it wouldn't only be really cool, it would also help to verify that these equations hold in the extreme conditions around the black hole.
## Solution

- bright
- backdrop
- darkness
- black
- picture
- reveals
- carving

## Original Text

But what happens if we were to zoom in even further? Is it possible to see something that, by definition, is impossible to see? Well, it turns out that if we were to zoom in at radio wavelengths, we'd expect to see a ring of light caused by the gravitational lensing of hot plasma zipping around the black hole. In other words, the black hole casts a shadow on this backdrop of bright material, carving out a sphere of darkness. This bright ring reveals the black hole's event horizon, where the gravitational pull becomes so great that not even light can escape. Einstein's equations predict the size and shape of this ring, so taking a picture of it wouldn't only be really cool, it would also help to verify that these equations hold in the extreme conditions around the black hole.
## Frequently Occurring Word Combinations

### ngrams of length 2

collocation |
frequency |

black hole |
29 |

puzzle pieces |
5 |

event horizon |
4 |

disco ball |
4 |

telescope measurements |
3 |

supermassive black |
2 |

gravitational pull |
2 |

computer graphic |
2 |

incredibly small |
2 |

horizon telescope |
2 |

collect light |
2 |

imaging algorithms |
2 |

hole image |
2 |

infinite number |
2 |

hole simulation |
2 |

image assumptions |
2 |

imaging ideas |
2 |

### ngrams of length 3

collocation |
frequency |

supermassive black hole |
2 |

event horizon telescope |
2 |

black hole image |
2 |

black hole simulation |
2 |

## Important Words

- backdrop
- black
- bright
- carving
- casts
- caused
- conditions
- cool
- darkness
- definition
- equations
- escape
- event
- expect
- extreme
- gravitational
- great
- hold
- hole
- horizon
- hot
- impossible
- lensing
- light
- material
- picture
- plasma
- predict
- pull
- radio
- reveals
- ring
- shadow
- shape
- size
- sphere
- turns
- verify
- wavelengths
- words
- zipping
- zoom