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← Measuring Starquakes

How Kepler has advanced our understanding of stars.

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Zeige Revision 2 erzeugt am 02/27/2020 von Cesslator.

  1. ♪ (background music:
  2. The Other Side of the Door) ♪
  3. You only know a planet as well as
    you know the star that it orbits.
  4. With Kepler, we have more than
    5,000 exoplanet detections.
  5. On top of that, it's made
    our understanding of stars
  6. far, far more advanced
    than it was six years ago.
  7. But it just so happens that
    the properties that you need
  8. from a spacecraft to be good
    at finding planets
  9. are also exactly the properties you need
  10. to be good at studying stars
    in certain ways.
  11. And the feature of Kepler
  12. that makes it great
    for stellar astronomy is the fact
  13. that it can measure
    the brightnesses of stars very precisely.
  14. That's the way you find planets,
  15. that's also the way you can see
    starquakes going on
  16. on the surfaces of stars.
  17. And those starquakes tell us about
    the masses of the stars themselves.
  18. We're familiar with earthquakes
  19. that are caused by
    tectonic plates shifting around,
  20. but the Earth actually quakes
    in a different way as well.
  21. It is constantly vibrating,
    and oscillating
  22. in much the same way that a bell would.
  23. It's oscillating at
    its resonant frequency,
  24. that's an earthquake.
  25. Stars are similar to planets,
    they are more rarefied,
  26. they're made of sort of more
    of a fluid than a solid,
  27. but they still oscillate
    like the Earth does.
  28. Bells ring all the time
    through air particles,
  29. exciting their resonant frequency.
  30. Stars are the same,
    they ring all the time.
  31. And just like a big bell has a deep ring,
  32. and a little bell has a high ring,
  33. stars are the same.
  34. So, if a star has a deep ring,
    it's massive,
  35. if it has a high ring,
    it's less massive.
  36. So, Kepler is really good at
    measuring masses of stars
  37. because it can see the stars ringing.
  38. And that's because it can measure
    the very precise brightness changes.
  39. Both in planets and in stars,
  40. Kepler has completely changed the field
  41. and revolutionized astronomy completely.
  42. ♪ (background music) ♪