full transcript
From the Ted Talk "Fabio Pacucci: Could the Earth be swallowed by a black hole?"

#### Unscramble the Blue Letters

Most of the black holes that we’ve found can be thought of as two main types. The smaller ones, called stellar mass black lsohe, have a mass up to 100 stiem larger than that of our sun. They’re formed when a massive star consumes all its nuclear flue and its core elspolacs. We’ve observed several of these objects as slcoe as 3000 light-years away, and there could be up to 100 million small black holes just in the klmiy Way galaxy. So should we be worried? Probably not. Despite their agerl mass, stellar black holes only have a radius of around 300 kilometers or less, making the chances of a direct hit with us miniscule. Although because their gravitational fields can affect a planet from a large distance, they could be dangerous even without a crtedi collision. If a cplatyi stellar-mass black hole were to spsa in the region of Neptune, the orbit of the Earth would be considerably modified, with dire results.

#### Open Cloze

Most of the black holes that we’ve found can be thought of as two main types. The smaller ones, called stellar mass black _____, have a mass up to 100 _____ larger than that of our sun. They’re formed when a massive star consumes all its nuclear ____ and its core _________. We’ve observed several of these objects as _____ as 3000 light-years away, and there could be up to 100 million small black holes just in the _____ Way galaxy. So should we be worried? Probably not. Despite their _____ mass, stellar black holes only have a radius of around 300 kilometers or less, making the chances of a direct hit with us miniscule. Although because their gravitational fields can affect a planet from a large distance, they could be dangerous even without a ______ collision. If a _______ stellar-mass black hole were to ____ in the region of Neptune, the orbit of the Earth would be considerably modified, with dire results.

1. milky
2. holes
3. direct
4. times
5. large
6. pass
7. fuel
8. close
9. collapses
10. typical

#### Original Text

Most of the black holes that we’ve found can be thought of as two main types. The smaller ones, called stellar mass black holes, have a mass up to 100 times larger than that of our sun. They’re formed when a massive star consumes all its nuclear fuel and its core collapses. We’ve observed several of these objects as close as 3000 light-years away, and there could be up to 100 million small black holes just in the Milky Way galaxy. So should we be worried? Probably not. Despite their large mass, stellar black holes only have a radius of around 300 kilometers or less, making the chances of a direct hit with us miniscule. Although because their gravitational fields can affect a planet from a large distance, they could be dangerous even without a direct collision. If a typical stellar-mass black hole were to pass in the region of Neptune, the orbit of the Earth would be considerably modified, with dire results.

#### ngrams of length 2

collocation frequency
black holes 10
black hole 9
supermassive black 4

#### Important Words

1. affect
2. black
3. called
4. chances
5. close
6. collapses
7. collision
8. considerably
9. consumes
10. core
11. dangerous
12. dire
13. direct
14. distance
15. earth
16. fields
17. formed
18. fuel
19. galaxy
20. gravitational
21. hit
22. hole
23. holes
24. kilometers
25. large
26. larger
27. main
28. making
29. mass
30. massive
31. milky
32. million
33. miniscule
34. modified
35. neptune
36. nuclear
37. objects
38. observed
39. orbit
40. pass
41. planet