full transcript
"From the Ted Talk by Patricia Burchat: Shedding light on dark matter"

Unscramble the Blue Letters

And so let me lead you through how we can do this. So here's an observer: it could be an eye; it could be a telescope. And suppose there's a galaxy out here in the usvnerie. How do we see that galaxy? A ray of light leaves the galaxy and travels through the universe for perhaps billions of years before it enters the telescope or your eye. Now, how do we deduce where the galaxy is? Well, we deduce it by the direction that the ray is traveling as it enters our eye, right? We say, the ray of light came this way; the galxay must be there, OK. Now, suppose I put in the middle a cluster of galaxies — and don't forget the dark mteatr, OK. Now, if we consider a different ray of light, one going off like this, we now need to take into account what Einstein peceidtrd when he developed geenral relativity. And that was that the gravitational field, due to mass, will deflect not only the tjcreoatry of particles, but will deflect light itself.

Open Cloze

And so let me lead you through how we can do this. So here's an observer: it could be an eye; it could be a telescope. And suppose there's a galaxy out here in the ________. How do we see that galaxy? A ray of light leaves the galaxy and travels through the universe for perhaps billions of years before it enters the telescope or your eye. Now, how do we deduce where the galaxy is? Well, we deduce it by the direction that the ray is traveling as it enters our eye, right? We say, the ray of light came this way; the ______ must be there, OK. Now, suppose I put in the middle a cluster of galaxies — and don't forget the dark ______, OK. Now, if we consider a different ray of light, one going off like this, we now need to take into account what Einstein _________ when he developed _______ relativity. And that was that the gravitational field, due to mass, will deflect not only the __________ of particles, but will deflect light itself.

Solution

  1. galaxy
  2. trajectory
  3. predicted
  4. matter
  5. universe
  6. general

Original Text

And so let me lead you through how we can do this. So here's an observer: it could be an eye; it could be a telescope. And suppose there's a galaxy out here in the universe. How do we see that galaxy? A ray of light leaves the galaxy and travels through the universe for perhaps billions of years before it enters the telescope or your eye. Now, how do we deduce where the galaxy is? Well, we deduce it by the direction that the ray is traveling as it enters our eye, right? We say, the ray of light came this way; the galaxy must be there, OK. Now, suppose I put in the middle a cluster of galaxies — and don't forget the dark matter, OK. Now, if we consider a different ray of light, one going off like this, we now need to take into account what Einstein predicted when he developed general relativity. And that was that the gravitational field, due to mass, will deflect not only the trajectory of particles, but will deflect light itself.

ngrams of length 2

collocation frequency
dark matter 29
dark energy 11
ordinary matter 4
electromagnetic spectrum 4
big questions 4
gravitational effects 3
gravitational lensing 3
graph paper 3

Important Words

  1. account
  2. billions
  3. cluster
  4. dark
  5. deduce
  6. deflect
  7. developed
  8. direction
  9. due
  10. einstein
  11. enters
  12. eye
  13. field
  14. forget
  15. galaxies
  16. galaxy
  17. general
  18. gravitational
  19. lead
  20. leaves
  21. light
  22. mass
  23. matter
  24. middle
  25. particles
  26. predicted
  27. put
  28. ray
  29. relativity
  30. suppose
  31. telescope
  32. trajectory
  33. traveling
  34. travels
  35. universe
  36. years