full transcript

## Unscramble the Blue Letters

Black holes are among the most duvtrstiece objects in the universe. Anything that gets too close to the central singularity of a black hole, be it an atesoird, planet, or star, risks being torn apart by its extreme gravitational field. And if the approaching object happens to cross the black hole’s event hoizorn, it’ll disappear and never re-emerge, adding to the black hole’s mass and expanding its radius in the process. There is nothing we could throw at a black hole that would do the least bit of damage to it. Even another black hole won’t drosety it– the two will simply merge into a larger black hole, releasing a bit of energy as grnoviiaatatl waves in the prcesos. By some accounts, it’s possible that the universe may eventually cnsoist entirely of bcalk holes in a very dstnait future. And yet, there may be a way to destroy, or “evaporate,” these objects after all. If the theory is true, all we need to do is to wait.

## Open Cloze

Black holes are among the most ___________ objects in the universe. Anything that gets too close to the central singularity of a black hole, be it an ________, planet, or star, risks being torn apart by its extreme gravitational field. And if the approaching object happens to cross the black hole’s event _______, it’ll disappear and never re-emerge, adding to the black hole’s mass and expanding its radius in the process. There is nothing we could throw at a black hole that would do the least bit of damage to it. Even another black hole won’t _______ it– the two will simply merge into a larger black hole, releasing a bit of energy as _____________ waves in the _______. By some accounts, it’s possible that the universe may eventually _______ entirely of _____ holes in a very _______ future. And yet, there may be a way to destroy, or “evaporate,” these objects after all. If the theory is true, all we need to do is to wait.

## Solution

1. asteroid
2. black
3. gravitational
4. process
5. horizon
6. distant
7. destructive
8. consist
9. destroy

## Original Text

Black holes are among the most destructive objects in the universe. Anything that gets too close to the central singularity of a black hole, be it an asteroid, planet, or star, risks being torn apart by its extreme gravitational field. And if the approaching object happens to cross the black hole’s event horizon, it’ll disappear and never re-emerge, adding to the black hole’s mass and expanding its radius in the process. There is nothing we could throw at a black hole that would do the least bit of damage to it. Even another black hole won’t destroy it– the two will simply merge into a larger black hole, releasing a bit of energy as gravitational waves in the process. By some accounts, it’s possible that the universe may eventually consist entirely of black holes in a very distant future. And yet, there may be a way to destroy, or “evaporate,” these objects after all. If the theory is true, all we need to do is to wait.

## Frequently Occurring Word Combinations

### ngrams of length 2

collocation frequency
black hole 10
black holes 6
hawking radiation 3
stephen hawking 2
oppositely charged 2
event horizon 2

## Important Words

1. accounts
2. adding
3. approaching
4. asteroid
5. bit
6. black
7. central
8. close
9. consist
10. cross
11. damage
12. destroy
13. destructive
14. disappear
15. distant
16. energy
17. event
18. eventually
19. expanding
20. extreme
21. field
22. future
23. gravitational
24. hole
25. holes
26. horizon
27. larger
28. mass
29. merge
30. object
31. objects
32. planet
33. process
34. radius
35. releasing
36. risks
37. simply
38. singularity
39. star
40. theory
41. throw
42. torn
43. true
44. universe
45. wait
46. waves