full transcript

## 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.

1. bright
2. backdrop
3. darkness
4. black
5. picture
6. reveals
7. 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

1. backdrop
2. black
3. bright
4. carving
5. casts
6. caused
7. conditions
8. cool
9. darkness
10. definition
11. equations
12. escape
13. event
14. expect
15. extreme
16. gravitational
17. great
18. hold
19. hole
20. horizon
21. hot
22. impossible
23. lensing
24. light
25. material
26. picture
27. plasma
28. predict
29. pull